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 A055024 Number of 1-punctured staircase polygons (by perimeter) with a hole of perimeter 6. 0

%I

%S 0,0,0,0,0,0,0,0,0,0,2,54,717,6836,53696,371464,2349981,13915712,

%T 78331106,423642906,2218481677,11313458780,56431232688,276253783984,

%U 1330866576164,6323282609184,29682658858324,137864087593740

%N Number of 1-punctured staircase polygons (by perimeter) with a hole of perimeter 6.

%D Guttmann, A.J. et al., Punctured polygons and polyominoes on the square lattice, J. Physics A: Math. and Gen, 33 (9) (2000), 1735-1764.

%p gf := (1 - 26*x + 228*x^2 - 906*x^3 + 1709*x^4 - 1378*x^5 + 322*x^6)/(2*(1 - 4*x)^(5/2)) - (32*x^6 - 404*x^5 + 815*x^4 - 586*x^3 + 182*x^2 - 24*x + 1)/(2*(1 - 4*x)^2): s := series(gf, x, 50): for i from 0 to 50 do printf(`%d,`,coeff(s,x,i)) od:

%K easy,nonn

%O 0,11

%A _James A. Sellers_, May 31 2000

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Last modified March 28 11:00 EDT 2020. Contains 333083 sequences. (Running on oeis4.)