a(1)=1, a(n) = a(n-1) + n^4 if n odd, a(n) = a(n-1) + n^5 if n is even.

Terms

a(0) =1a(1) =33a(2) =114a(3) =1138a(4) =1763a(5) =9539a(6) =11940a(7) =44708a(8) =51269a(9) =151269a(10) =165910a(11) =414742a(12) =443303a(13) =981127a(14) =1031752a(15) =2080328a(16) =2163849a(17) =4053417a(18) =4183738a(19) =7383738a(20) =7578219a(21) =12731851a(22) =13011692a(23) =20974316a(24) =21364941a(25) =33246317a(26) =33777758a(27) =50988126