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A026092
a(n) = T(2n,n-1), where T is the array defined in A026082.
0
1, 1, 9, 45, 248, 1377, 7756, 44096, 252570, 1455166, 8424011, 48960606, 285512823, 1669721225, 9788890230, 57511916805, 338536358979, 1996103321754, 11787262391390, 69699393574522
OFFSET
1,3
CROSSREFS
Sequence in context: A189274 A270567 A316108 * A054628 A132133 A009410
KEYWORD
nonn
STATUS
approved