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A027313
a(n) = Sum_{k=0..2n} (k+1) *
A026323
(n, 2n-k).
0
1, 6, 27, 81, 243, 729, 2187, 6561, 19683, 59049, 177147, 531441, 1594323, 4782969, 14348907, 43046721, 129140163, 387420489, 1162261467, 3486784401, 10460353203, 31381059609, 94143178827, 282429536481, 847288609443
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..24.
FORMULA
For n>1, a(n) = 3^(n+1).
CROSSREFS
Sequence in context:
A239568
A385730
A198958
*
A217365
A307040
A124089
Adjacent sequences:
A027310
A027311
A027312
*
A027314
A027315
A027316
KEYWORD
nonn
AUTHOR
Clark Kimberling
STATUS
approved
