A200449 - OEIS

A200449

Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences.

26, 142, 728, 3788, 19802, 103726, 548204, 2916664, 15576706, 83481240, 448758338, 2418733790, 13066215896, 70726653732, 383520053994, 2082953525918, 11328873637896, 61694898371006, 336368349457684, 1835858710497508

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OFFSET

1,1

COMMENTS

Column 3 of A200454

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=3

.-3...-3....0....2...-1....3....0....0....3....1....1...-2...-3...-1....3...-3

..2....0....2....3....1...-3....3....1...-1...-3...-2...-3....2...-2...-3...-2

.-3...-1...-3...-3...-2...-2....0....3....1....3...-1....0....3....1...-1....2

..3....3...-1...-2....2....2...-2...-3...-3....1....3....2....1...-1....3....1

..1....1....2....0....0....0...-1...-1....0...-2...-1....3...-3....3...-2....2

CROSSREFS

Sequence in context: A223418 A331458 A238917 * A248465 A014552 A192289

Adjacent sequences: A200446 A200447 A200448 * A200450 A200451 A200452

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 18 2011

STATUS

approved