Number of (undirected) paths in the n-antiprism graph.

Terms

a(0) =2a(1) =56a(2) =396a(3) =2040a(4) =9130a(5) =37944a(6) =151172a(7) =586608a(8) =2235618a(9) =8407640a(10) =31292844a(11) =115494312a(12) =423283562a(13) =1542120664a(14) =5589611460a(15) =20170172896a(16) =72499928322a(17) =259692909048a(18) =927342338956