Product plus sum of four consecutive nonnegative numbers.

Terms

a(0) =6a(1) =34a(2) =134a(3) =378a(4) =862a(5) =1706a(6) =3054a(7) =5074a(8) =7958a(9) =11922a(10) =17206a(11) =24074a(12) =32814a(13) =43738a(14) =57182a(15) =73506a(16) =93094a(17) =116354a(18) =143718a(19) =175642a(20) =212606a(21) =255114a(22) =303694a(23) =358898a(24) =421302a(25) =491506a(26) =570134a(27) =657834a(28) =755278a(29) =863162