Expansion of Product_{k>=1} (1 + x^k)^binomial(k+4,4).

Terms

a(0) =1a(1) =5a(2) =25a(3) =120a(4) =505a(5) =2027a(6) =7740a(7) =28345a(8) =100355a(9) =344815a(10) =1154130a(11) =3773955a(12) =12085125a(13) =37971645a(14) =117258755a(15) =356386016a(16) =1067364240a(17) =3153415695a(18) =9198749905a(19) =26516197720a(20) =75586609016a(21) =213212467695a(22) =595482274750