G.f.: (1+38*x+262*x^2+475*x^3+254*x^4+37*x^5+x^6)/(1-x)^7.

Terms

a(0) =1a(1) =45a(2) =556a(3) =3457a(4) =14317a(5) =45565a(6) =120772a(7) =280001a(8) =586225a(9) =1132813a(10) =2052084a(11) =3524929a(12) =5791501a(13) =9162973a(14) =14034364a(15) =20898433a(16) =30360641a(17) =43155181a(18) =60162076a(19) =82425345a(20) =111172237a(21) =147833533a(22) =194064916a(23) =251769409a(24) =323120881a(25) =410588621a(26) =516962980