Expansion of Sum_{k>=0} x^(3*k) / (1 - k*x)^(k+1).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =3a(6) =5a(7) =11a(8) =30a(9) =88a(10) =260a(11) =771a(12) =2343a(13) =7474a(14) =25380a(15) =91650a(16) =347988a(17) =1371873a(18) =5570173a(19) =23233703a(20) =99676434a(21) =440931977a(22) =2014619700a(23) =9506385864a(24) =46246356169a(25) =231348803925