Expansion of Product_{k>=1} 1/(1 - k^2*x^k)^k.

Terms

a(0) =1a(1) =1a(2) =9a(3) =36a(4) =148a(5) =489a(6) =1959a(7) =6326a(8) =22741a(9) =74072a(10) =246436a(11) =781189a(12) =2523042a(13) =7773342a(14) =24200874a(15) =73439472a(16) =222247101a(17) =660405663a(18) =1958564056a(19) =5715567301a(20) =16623600991a(21) =47780474694a(22) =136623175876a(23) =386983158080