A027255 Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026703.

1, 12, 97, 618, 3841, 21050, 119447, 615402, 3346316, 16708316, 88765368, 435341688, 2280888072, 11063821616, 57457039508, 276725405106, 1428712334412, 6848186443752, 35215486379288, 168242713587526, 862738339740944, 4112242003155592, 21045362383845012, 100147569980681634

Offset

3,2

Links

Table of n, a(n) for n=3..26.

Crossrefs

Sequence in context: A219139 A059375 A251430 * A121791 A016753 A078605

Adjacent sequences: A027252 A027253 A027254 * A027256 A027257 A027258

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 26 2019

Status

approved