A290865(n) -(n-1).

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =11a(5) =25a(6) =50a(7) =91a(8) =153a(9) =241a(10) =360a(11) =525a(12) =736a(13) =1014a(14) =1365a(15) =1792a(16) =2304a(17) =2937a(18) =3684a(19) =4585a(20) =5632a(21) =6831a(22) =8217a(23) =9835a(24) =11659a(25) =13723a(26) =16060a(27) =18673a(28) =21576a(29) =24858