G.f.: Product_{k>=1} 1/(1-x^k)^(8*k).

Terms

a(0) =1a(1) =8a(2) =52a(3) =272a(4) =1266a(5) =5344a(6) =20992a(7) =77584a(8) =272727a(9) =917936a(10) =2975492a(11) =9328736a(12) =28391410a(13) =84122688a(14) =243265848a(15) =688008048a(16) =1906476351a(17) =5184024112a(18) =13851270944a(19) =36409640400a(20) =94255399886a(21) =240529147072a(22) =605574003464