A027986 Sum{T(n,k)*T(n,k+2)}, 0<=k<=2n-2, T given by A027960.

20, 100, 420, 1694, 6746, 26735, 105722, 417613, 1648692, 6507197, 25681362, 101359219, 400094756, 1579568360, 6237401648, 24635828774, 97327071806, 384596629610, 1520138671688, 6009885957464, 23765835521966, 94003008751940

Offset

2,1

Links

Table of n, a(n) for n=2..23.

Crossrefs

Sequence in context: A039455 A294112 A188050 * A240437 A174078 A239857

Adjacent sequences: A027983 A027984 A027985 * A027987 A027988 A027989

Keyword

nonn

Author

Clark Kimberling

Status

approved