Expansion of Product_{k>=1} (1 + x^k)^binomial(k+3,4).

Terms

a(0) =1a(1) =1a(2) =5a(3) =20a(4) =60a(5) =190a(6) =561a(7) =1651a(8) =4720a(9) =13300a(10) =36716a(11) =99872a(12) =267836a(13) =708890a(14) =1854255a(15) =4796273a(16) =12279445a(17) =31135188a(18) =78236006a(19) =194921680a(20) =481758832a(21) =1181675902a(22) =2877646681a(23) =6959866116a(24) =16723591530a(25) =39934902812a(26) =94795718409a(27) =223741936855a(28) =525206126933