A027297 a(n) = Sum_{k=0..floor((n-3)/2)} T(n,k) * T(n,k+3), with T given by A026022.

1, 4, 30, 104, 567, 1952, 9453, 32900, 150029, 528956, 2327156, 8303216, 35679835, 128633440, 543723257, 1977821700, 8260172309, 30278441400, 125314192728, 462409521376, 1900445030538, 7053236494784, 28828752666375, 107536008386924, 437602449724101

Offset

3,2

Links

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

Crossrefs

Sequence in context: A014697 A328103 A211624 * A211628 A166761 A213824

Adjacent sequences: A027294 A027295 A027296 * A027298 A027299 A027300

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 26 2019

Status

approved