Fourth right hand column of the RSEG2 triangle A161739.

Terms

a(0) =0a(1) =30a(2) =425a(3) =3008a(4) =14572a(5) =55060a(6) =174130a(7) =481360a(8) =1197196a(9) =2733874a(10) =5817955a(11) =11668800a(12) =22250280a(13) =40616264a(14) =71373956a(15) =121292960a(16) =200092040a(17) =321439910a(18) =504211037a(19) =774042368a(20) =1165242100a(21) =1723107100a(22) =2506711350a(23) =3592233840