A027105 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,2n-k), with T given by A027082.

1, 5, 16, 68, 276, 1084, 4227, 16207, 61348, 229888, 853737, 3146649, 11522891, 41959547, 152044236, 548575204, 1971713228, 7062750256, 25222033633, 89824310345, 319101174069, 1131049761757, 4000730847474, 14124602551114

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Crossrefs

Sequence in context: A128242 A323934 A166932 * A254203 A220903 A042087

Adjacent sequences: A027102 A027103 A027104 * A027106 A027107 A027108

Keyword

nonn

Author

Clark Kimberling

Status

approved