OFFSET
1,8
FORMULA
Recurrence: 2*n*a(n) = -3*(n-2)*a(n-1) - (8*n - 27)*a(n-2) + 5*(n-3)*a(n-3). - Vaclav Kotesovec, Jan 02 2021
G.f.: (1 - 3*x - sqrt(1 + 2*x + 5*x^2)) / (2*(x-2)). - Vaclav Kotesovec, Jan 04 2021
MATHEMATICA
Rest[CoefficientList[InverseSeries[Series[x*(1 + 2x)/(1 + 3x + x^2), {x, 0, 40}], x], x]] (* Vaclav Kotesovec, Jan 02 2021 *)
CROSSREFS
KEYWORD
sign
AUTHOR
EXTENSIONS
NAME multiplied by x. - R. J. Mathar, Jul 23 2023
STATUS
approved