Column 8 of array illustrated in A089574 and related to A034261.

Terms

a(0) =18a(1) =207a(2) =1198a(3) =4825a(4) =15448a(5) =42168a(6) =102297a(7) =226530a(8) =466357a(9) =904352a(10) =1668083a(11) =2948502a(12) =5023797a(13) =8289819a(14) =13298336a(15) =20804513a(16) =31825172a(17) =47709549a(18) =70224436a(19) =101655775a(20) =144928958a(21) =203750282a(22) =282772211a(23) =387785308a(24) =525939919a(25) =706000918a(26) =938639057a(27) =1236762708a(28) =1615894035a(29) =2094593893