a(1)=1, a(n) = a(n-1) + n^5 if n odd, a(n) = a(n-1) + n^0 if n is even.

Terms

a(0) =1a(1) =2a(2) =245a(3) =246a(4) =3371a(5) =3372a(6) =20179a(7) =20180a(8) =79229a(9) =79230a(10) =240281a(11) =240282a(12) =611575a(13) =611576a(14) =1370951a(15) =1370952a(16) =2790809a(17) =2790810a(18) =5266909a(19) =5266910a(20) =9351011a(21) =9351012a(22) =15787355a(23) =15787356a(24) =25552981a(25) =25552982a(26) =39901889a(27) =39901890a(28) =60413039