Column 7 of triangle A055907.

Terms

a(0) =1a(1) =14a(2) =100a(3) =511a(4) =2116a(5) =7501a(6) =23527a(7) =66834a(8) =174953a(9) =427486a(10) =984654a(11) =2154809a(12) =4508722a(13) =9067082a(14) =17600002a(15) =33094234a(16) =60466665a(17) =107632267a(18) =187074805a(19) =318119850a(20) =530176267a(21) =867294295a(22) =1394495598a(23) =2206460931a(24) =3439326144