A049183 Revert transform of 2*x*(1 - x - x^3 + x^6)-x/(1+x).

1, 1, 3, 11, 45, 195, 885, 4151, 19963, 97899, 487717, 2461393, 12557439, 64657461, 335562499, 1753538133, 9218852525, 48725353661, 258759350495, 1380021781719, 7388261669161, 39692491630271, 213918652593929

Offset

1,3

Comments

Sign diagram of generating sequence: +++-+--+--------...

Links

Table of n, a(n) for n=1..23.

Index entries for reversions of series

Maple

Order := 80:
g := 2*x*(1-x-x^3+x^6)-x/(1+x) ;
solve(series(g, x)=y, x) :
convert(%, polynom) :
seq(coeff(%, y, i), i=0..Order-1) ; # R. J. Mathar, Jul 24 2023

Crossrefs

Sequence in context: A151127 A026375 A151128 * A049166 A049172 A049155

Adjacent sequences: A049180 A049181 A049182 * A049184 A049185 A049186

Keyword

nonn

Author

Olivier Gérard

Extensions

NAME corrected. - R. J. Mathar, Jul 24 2023

Status

approved