Column k = 4 of triangular array in A165241.

Terms

a(0) =1a(1) =15a(2) =105a(3) =532a(4) =2241a(5) =8361a(6) =28610a(7) =91740a(8) =279624a(9) =818272a(10) =2315712a(11) =6372480a(12) =17123840a(13) =45082368a(14) =116596224a(15) =296879104a(16) =745543680a(17) =1849344000a(18) =4536958976a(19) =11020075008a(20) =26526547968a(21) =63329075200a(22) =150057123840