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A027334
a(n) = Sum_{k=0..m} (k+1) * A026148(n, m-k), where m=0 for n=1; m=n+1 for n >= 2.
0
1, 3, 18, 54, 162, 486, 1458, 4374, 13122, 39366, 118098, 354294, 1062882, 3188646, 9565938, 28697814, 86093442, 258280326, 774840978, 2324522934, 6973568802, 20920706406, 62762119218, 188286357654, 564859072962
OFFSET
0,2
FORMULA
For n>1, a(n) = 2*3^n.
a(n)=A008776(n), n>1. [From R. J. Mathar, Oct 23 2008]
CROSSREFS
Sequence in context: A268484 A085789 A361083 * A130505 A222204 A027289
KEYWORD
nonn
STATUS
approved