Expansion of exp(Sum_{k>=1} (-1)^(k+1)*x^k/(k*sqrt(1 - 4*x^k))).

Terms

a(0) =1a(1) =1a(2) =2a(3) =8a(4) =27a(5) =103a(6) =389a(7) =1497a(8) =5786a(9) =22556a(10) =88230a(11) =346576a(12) =1365119a(13) =5390585a(14) =21327913a(15) =84527939a(16) =335477433a(17) =1333079925a(18) =5302763618a(19) =21112688376a(20) =84125853415a(21) =335443149005