Recurrence a(n) = a(n-2) + n^M for M=7, starting with a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =128a(3) =2188a(4) =16512a(5) =80313a(6) =296448a(7) =903856a(8) =2393600a(9) =5686825a(10) =12393600a(11) =25173996a(12) =48225408a(13) =87922513a(14) =153638912a(15) =258781888a(16) =422074368a(17) =669120561a(18) =1034294400a(19) =1562992300a(20) =2314294400a(21) =3364080841a(22) =4808652288a(23) =6768906288a(24) =9395123712a(25) =12872421913a(26) =17426933888