a(n) = Sum_{k=1..n} T(n,k), array T as in A049790.

Terms

a(0) =1a(1) =5a(2) =14a(3) =30a(4) =54a(5) =91a(6) =137a(7) =202a(8) =280a(9) =380a(10) =492a(11) =644a(12) =799a(13) =994a(14) =1212a(15) =1471a(16) =1735a(17) =2071a(18) =2400a(19) =2811a(20) =3232a(21) =3709a(22) =4190a(23) =4804a(24) =5380a(25) =6046a(26) =6739a(27) =7535a(28) =8297a(29) =9246