A026949 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026374.

1, 12, 83, 630, 3171, 21672, 97482, 639180, 2730615, 17543196, 72932904, 463291920, 1895949055, 11961944400, 48478715240, 304543085040, 1226501910315, 7682898791700, 30811853728475, 192632866196694, 770315837004637, 4809438625979592, 19193549752057758, 119719958370912900

Offset

3,2

Links

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

Crossrefs

Cf. A026374.

Sequence in context: A252179 A102105 A275743 * A165127 A213347 A075476

Adjacent sequences: A026946 A026947 A026948 * A026950 A026951 A026952

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 17 2019

Status

approved