a(n) = Sum_{k=1..n} T(n,k), array T as in A049840.

Terms

a(0) =1a(1) =4a(2) =11a(3) =19a(4) =36a(5) =45a(6) =74a(7) =92a(8) =119a(9) =144a(10) =199a(11) =203a(12) =276a(13) =307a(14) =346a(15) =394a(16) =483a(17) =504a(18) =613a(19) =621a(20) =704a(21) =785a(22) =918a(23) =896a(24) =1033a(25) =1128a(26) =1207a(27) =1271a(28) =1462a(29) =1421