Column 7 of array illustrated in A089574 and related to A034261.

Terms

a(0) =2a(1) =41a(2) =292a(3) =1283a(4) =4253a(5) =11712a(6) =28261a(7) =61738a(8) =124763a(9) =236762a(10) =426557a(11) =735616a(12) =1222064a(13) =1965563a(14) =3073176a(15) =4686337a(16) =6989056a(17) =10217495a(18) =14671058a(19) =20725145a(20) =28845727a(21) =39605906a(22) =53704631a(23) =71987748a(24) =95471569a(25) =125369152a(26) =163119491