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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
OFFSET
0,2
FORMULA
For n>1, a(n) = 3^(n+1).
CROSSREFS
Sequence in context: A136105 A239568 A198958 * A217365 A307040 A124089
KEYWORD
nonn
STATUS
approved