a(n) = A160799(n)/4.

Terms

a(0) =0a(1) =1a(2) =5a(3) =12a(4) =28a(5) =47a(6) =75a(7) =112a(8) =176a(9) =243a(10) =319a(11) =404a(12) =516a(13) =637a(14) =785a(15) =960a(16) =1216a(17) =1475a(18) =1743a(19) =2020a(20) =2324a(21) =2637a(22) =2977a(23) =3344a(24) =3792a(25) =4249a(26) =4733a(27) =5244a(28) =5836a(29) =6455