a(n)=Sum{T(n,j): j=1,2,...,n}, array T given by A048225.

Terms

a(0) =3a(1) =5a(2) =11a(3) =31a(4) =76a(5) =136a(6) =220a(7) =324a(8) =459a(9) =639a(10) =870a(11) =1146a(12) =1523a(13) =1971a(14) =2481a(15) =3073a(16) =3770a(17) =4544a(18) =5399a(19) =6339a(20) =7347a(21) =8513a(22) =9801a(23) =11169a(24) =12669a(25) =14307a(26) =16062a(27) =17994a(28) =20082a(29) =22302