OFFSET
0,6
LINKS
Brian Drake, Limits of areas under lattice paths, Discrete Math. 309 (2009), no. 12, 3936-3953. See Example 4.
EXAMPLE
Triangle begins
1
1 1
1 1 2 2 1
1 1 2 2 4 5 5 5 3 1
1 1 2 2 4 5 8 10 12 13 15 17 16 13 9 4 1
...
MATHEMATICA
gf = Expand /@ FixedPoint[1 + x # + q x (1 + q x) # (Normal@# /. {x :> q^2 x}) + O[x]^7 &, 0];
Flatten[Reverse[CoefficientList[#, q]] & /@ CoefficientList[gf, x]] (* Andrey Zabolotskiy, Jan 03 2024 *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
N. J. A. Sloane, Nov 27 2011
EXTENSIONS
More terms from Andrey Zabolotskiy, Jan 03 2024
STATUS
approved