a(n) = (3*(2*n - 1)^2*((2*n - 1)^2 + 2) + 2*n + 1)/2 for n > 0.

Terms

a(0) =6a(1) =151a(2) =1016a(3) =3753a(4) =10090a(5) =22331a(6) =43356a(7) =76621a(8) =126158a(9) =196575a(10) =293056a(11) =421361a(12) =587826a(13) =799363a(14) =1063460a(15) =1388181a(16) =1782166a(17) =2254631a(18) =2815368a(19) =3474745a(20) =4243706a(21) =5133771a(22) =6157036a(23) =7326173a(24) =8654430a(25) =10155631a(26) =11844176a(27) =13735041a(28) =15843778a(29) =18186515