a(n) = self-convolution of row n of array T given by A026780.

A027247

a(n) = self-convolution of row n of array T given by A026780.

Terms

    a(0) =1a(1) =2a(2) =11a(3) =42a(4) =216a(5) =926a(6) =4805a(7) =21594a(8) =113176a(9) =523158a(10) =2766030a(11) =13043426a(12) =69508528a(13) =332880898a(14) =1786840975a(15) =8666578226a(16) =46835595908a(17) =229627064562

External references