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A026074
a(n) = T(3n,n), where T is the array defined in A024996.
0
1, 1, 12, 91, 726, 5902, 48704, 406353, 3419020, 28958955, 246598716, 2109182557, 18106771400, 155929895685, 1346442959176, 11653675471305, 101071521560286, 878176794266261, 7642505705447340, 66606583068846975
OFFSET
0,3
CROSSREFS
Sequence in context: A001503 A004311 A160869 * A339715 A298397 A246585
KEYWORD
nonn
STATUS
approved