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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
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..24.
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
Adjacent sequences:
A027331
A027332
A027333
*
A027335
A027336
A027337
KEYWORD
nonn
AUTHOR
Clark Kimberling
STATUS
approved
