a(n) = 4*n^5 + 10*n^4 + 13*n^3 + 11*n^2 + 5*n + 1.

Terms

a(0) =1a(1) =44a(2) =447a(3) =2248a(4) =7685a(5) =20676a(6) =47299a(7) =96272a(8) =179433a(9) =312220a(10) =514151a(11) =809304a(12) =1226797a(13) =1801268a(14) =2573355a(15) =3590176a(16) =4905809a(17) =6581772a(18) =8687503a(19) =11300840a(20) =14508501a(21) =18406564a(22) =23100947a(23) =28707888a(24) =35354425a(25) =43178876a(26) =52331319