a(1)=1, a(n)=a(n-1)+n^0 if n odd, a(n)=a(n-1)+ n^4 if n is even.

Terms

a(0) =1a(1) =17a(2) =18a(3) =274a(4) =275a(5) =1571a(6) =1572a(7) =5668a(8) =5669a(9) =15669a(10) =15670a(11) =36406a(12) =36407a(13) =74823a(14) =74824a(15) =140360a(16) =140361a(17) =245337a(18) =245338a(19) =405338a(20) =405339a(21) =639595a(22) =639596a(23) =971372a(24) =971373a(25) =1428349a(26) =1428350a(27) =2043006a(28) =2043007a(29) =2853007