OFFSET
0,2
COMMENTS
See Dziemianczuk (2014) for precise definition.
LINKS
Lars Blomberg, Table of n, a(n) for n = 0..100
M. Dziemianczuk, On Directed Lattice Paths With Additional Vertical Steps, arXiv preprint arXiv:1410.5747 [math.CO], 2014.
FORMULA
See Dziemianczuk (2014) Equation (29a) with m=1.
From Vaclav Kotesovec, Jul 15 2022: (Start)
Recurrence: (n-2)*n*(n+1)*(100*n^3 - 510*n^2 + 677*n - 111)*a(n) = -6*n*(40*n^3 - 5*n^2 - 586*n + 863)*a(n-1) + 4*(n-1)*(1100*n^5 - 6710*n^4 + 12387*n^3 - 3775*n^2 - 8723*n + 5448)*a(n-2) - 72*(n-2)*(n-1)*(10*n^2 - 5*n - 24)*a(n-3) + 16*(n-3)*(n-2)*(n-1)*(100*n^3 - 210*n^2 - 43*n + 156)*a(n-4).
a(n) ~ sqrt((4*phi^6 - 1)/5 + phi^(11/2)) * 2^(n-1) * phi^(5*n/2) / sqrt(Pi*n), where phi = A001622 is the golden ratio. (End)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 30 2015
EXTENSIONS
More terms from Lars Blomberg, Aug 01 2015
STATUS
approved