OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Cyril Banderier, Markus Kuba, Stephan Wagner, and Michael Wallner, Composition schemes: q-enumerations and phase transitions, arXiv:2311.17226 [math.CO], 2023. See p. 7.
FORMULA
a(n) = A001006(n)^2.
MATHEMATICA
CoefficientList[Series[(1 - x - (1 - 2x - 3x^2)^(1/2))/(2x^2), {x, 0, 50}], x]^2 (* or *) Table[Hypergeometric2F1[(1-n)/2, -n/2, 2, 4], {n, 0, 50}]^2 (* G. C. Greubel, Oct 03 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Oct 30 2007
STATUS
approved