A027111 a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A027082.

6, 52, 404, 3237, 26086, 211730, 1730114, 14223429, 117563545, 976408938, 8144436109, 68197885773, 573056586975, 4830577196508, 40836850965484, 346138265331977, 2941011994449017, 25044401420362382, 213706426365981010, 1827057028991860141, 15647888579758708485

Offset

2,1

Links

Table of n, a(n) for n=2..22.

Crossrefs

Sequence in context: A202925 A287082 A007974 * A083301 A334978 A005948

Adjacent sequences: A027108 A027109 A027110 * A027112 A027113 A027114

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 23 2019

Status

approved