A066957 - OEIS

A066957

a(n) = number of ways of placing '+' and '-' among the digits 123456789 so that the result of the expression is n, '-' before 1 IS allowed.

22, 43, 18, 41, 18, 40, 24, 39, 18, 46, 17, 38, 27, 38, 24, 43, 18, 39, 23, 37, 23, 43, 25, 36, 32, 36, 25, 44, 25, 35, 34, 31, 26, 37, 24, 35, 32, 32, 27, 37, 31, 26, 34, 34, 29, 42, 27, 27, 35, 26, 28, 35, 29, 33, 30, 26, 23, 29, 32, 25, 33, 30, 24, 34, 22, 26, 32, 30, 25

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OFFSET

0,1

COMMENTS

From Reinhard Zumkeller, Jan 12 2008: (Start)

A066957(9)=46 is the largest term.

A066957(456789)=2 is the last term greater than 1.

a(n)=0 for n>123456789. 1715 terms are greater than 0.

a(A136601(n))=0; a(A136602(n))>0; a(A136603(n))=1.

Partial sums are A136604. (End)

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000