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A260346 Expansion of x^2*((1 - 12*x + 50*x^2 - 76*x^3 + 42*x^4 - 48*x^5 + 32*x^6)/(1 - 4*x)^4 + 4*x^2/(1 - 4*x)^(5/2)). 1
0, 0, 1, 4, 22, 124, 706, 3968, 21880, 118192, 625776, 3251744, 16610072, 83537520, 414288080, 2028760544, 9822006896, 47063458528, 223408338400, 1051514839104, 4910856580376, 22772597352944, 104914684398352, 480457417780320, 2188115766353616, 9914318477830304, 44708936142838816 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..26.

I. G. Enting and A. J. Guttmann, Area-weighted moments of convex polygons on the square lattice, J. Phys. A 22 (1989), 2639-2642. See Eq. (4).

FORMULA

G.f.: x^2*((1 - 12*x + 50*x^2 - 76*x^3 + 42*x^4 - 48*x^5 + 32*x^6)/(1 - 4*x)^4 + 4*x^2/(1 - 4*x)^(5/2)).

MAPLE

t1:=x^2*( (1-12*x+50*x^2-76*x^3+42*x^4-48*x^5+32*x^6)/(1-4*x)^4 + 4*x^2/(1-4*x)^(5/2));

series(t1, x, 40);

seriestolist(%);

CROSSREFS

Cf. A005436.

Sequence in context: A236576 A185858 A180034 * A136777 A056625 A116428

Adjacent sequences:  A260343 A260344 A260345 * A260347 A260348 A260349

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 02 2015

STATUS

approved

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Last modified October 27 11:44 EDT 2021. Contains 348276 sequences. (Running on oeis4.)