A026092 a(n) = T(2n,n-1), where T is the array defined in A026082.

1, 1, 9, 45, 248, 1377, 7756, 44096, 252570, 1455166, 8424011, 48960606, 285512823, 1669721225, 9788890230, 57511916805, 338536358979, 1996103321754, 11787262391390, 69699393574522

Offset

1,3

Links

Table of n, a(n) for n=1..20.

Crossrefs

Sequence in context: A189274 A270567 A316108 * A054628 A132133 A009410

Adjacent sequences: A026089 A026090 A026091 * A026093 A026094 A026095

Keyword

nonn

Author

Clark Kimberling

Status

approved