Fourth column of triangle A060058.

Terms

a(0) =61a(1) =1385a(2) =12284a(3) =68060a(4) =281210a(5) =948002a(6) =2749340a(7) =7097948a(8) =16700255a(9) =36419955a(10) =74551048a(11) =144631240a(12) =267951892a(13) =476948260a(14) =819683560a(15) =1365672424a(16) =2213323585a(17) =3499318141a(18) =5410278500a(19) =8197124100