Column 4 of A061315.

Terms

a(0) =0a(1) =1a(2) =10a(3) =76a(4) =430a(5) =1870a(6) =6601a(7) =19810a(8) =52326a(9) =124785a(10) =273790a(11) =560626a(12) =1083160a(13) =1991626a(14) =3509065a(15) =5957260a(16) =9789076a(17) =15628185a(18) =24317226a(19) =36975520a(20) =55067530a(21) =80483326a(22) =115632385a(23) =163552126a(24) =228032650a(25) =313759225a(26) =426474126a(27) =573159510