One third of product plus sum of three consecutive nonnegative integers; a(n)=(n+1)(n^2+2n+3)/3.

Terms

a(0) =1a(1) =4a(2) =11a(3) =24a(4) =45a(5) =76a(6) =119a(7) =176a(8) =249a(9) =340a(10) =451a(11) =584a(12) =741a(13) =924a(14) =1135a(15) =1376a(16) =1649a(17) =1956a(18) =2299a(19) =2680a(20) =3101a(21) =3564a(22) =4071a(23) =4624a(24) =5225a(25) =5876a(26) =6579a(27) =7336a(28) =8149a(29) =9020