Column 1 of triangle A102916.

Terms

a(0) =0a(1) =2a(2) =4a(3) =8a(4) =40a(5) =152a(6) =1128a(7) =6200a(8) =61120a(9) =442552a(10) =5466320a(11) =49399320a(12) =735847800a(13) =8003532512a(14) =139910204080