Principal diagonal of the convolution array A212891.

Terms

a(0) =1a(1) =17a(2) =84a(3) =260a(4) =625a(5) =1281a(6) =2352a(7) =3984a(8) =6345a(9) =9625a(10) =14036a(11) =19812a(12) =27209a(13) =36505a(14) =48000a(15) =62016a(16) =78897a(17) =99009a(18) =122740a(19) =150500a(20) =182721a(21) =219857a(22) =262384a(23) =310800a(24) =365625a(25) =427401a(26) =496692a(27) =574084a(28) =660185a(29) =755625