A027210 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026725.

1, 9, 57, 298, 1545, 7126, 34603, 151633, 714481, 3049328, 14131926, 59385159, 272409611, 1133433579, 5163641033, 21341122875, 96751092786, 397978832144, 1797722306693, 7369285976135, 33195299823112, 135723491400062, 610027809595308, 2489247495517382, 11168400384253936

Offset

3,2

Links

Table of n, a(n) for n=3..27.

Maple

A027210 := proc(n)
    add( A026725(n, k)*A026725(n, k+3), k=0..n-3) ;
end proc: # R. J. Mathar, Oct 21 2019

Crossrefs

Sequence in context: A231315 A338080 A064838 * A192054 A045720 A014916

Adjacent sequences: A027207 A027208 A027209 * A027211 A027212 A027213

Keyword

nonn

Author

Clark Kimberling

Extensions

Name corrected by R. J. Mathar, Oct 21 2019

More terms from Sean A. Irvine, Oct 24 2019

Status

approved