Fourth column (m=5) of array A090452.

Terms

a(0) =15a(1) =105a(2) =396a(3) =1110a(4) =2600a(5) =5390a(6) =10220a(7) =18096a(8) =30345a(9) =48675a(10) =75240a(11) =112710a(12) =164346a(13) =234080a(14) =326600a(15) =447440a(16) =603075a(17) =801021a(18) =1049940a(19) =1359750a(20) =1741740a(21) =2208690a(22) =2774996a(23) =3456800a(24) =4272125a(25) =5241015a(26) =6385680a(27) =7730646a(28) =9302910a(29) =11132100