A027250 a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026780.

1, 12, 95, 639, 3917, 23377, 132553, 762434, 4201955, 23901906, 130453555, 740755012, 4035754137, 22952934073, 125259143235, 714206660342, 3909459844469, 22346990842402, 122748276118411, 703146926077588, 3875572768594421, 22238537172443007, 122969745150601115

Offset

3,2

Links

Table of n, a(n) for n=3..25.

Crossrefs

Sequence in context: A038836 A026860 A021074 * A194782 A059154 A204630

Adjacent sequences: A027247 A027248 A027249 * A027251 A027252 A027253

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Oct 26 2019

Status

approved