Expansion of Sum_{k>=0} x^k / (1 - k*x^2)^(k+1).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =16a(6) =45a(7) =125a(8) =363a(9) =1127a(10) =3561a(11) =11696a(12) =39727a(13) =138113a(14) =494213a(15) =1811075a(16) =6784115a(17) =25985928a(18) =101520833a(19) =404305549a(20) =1640002039a(21) =6767576175a(22) =28395916893a(23) =121048681024a(24) =523902418555