Column 4 of triangle A123610.

Terms

a(0) =1a(1) =5a(2) =39a(3) =175a(4) =618a(5) =1764a(6) =4420a(7) =9900a(8) =20439a(9) =39325a(10) =71603a(11) =124215a(12) =207076a(13) =333200a(14) =520272a(15) =790704a(16) =1173805a(17) =1705725a(18) =2432375a(19) =3409175a(20) =4704846a(21) =6400900a(22) =8596484a(23) =11407500a(24) =14972643a(25) =19452069a(26) =25034835a(27) =31936975a(28) =40410504a(29) =50740800