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A201236 Number of ways to place 2 non-attacking wazirs on an n X n toroidal board. 8
0, 2, 18, 88, 250, 558, 1078, 1888, 3078, 4750, 7018, 10008, 13858, 18718, 24750, 32128, 41038, 51678, 64258, 79000, 96138, 115918, 138598, 164448, 193750, 226798, 263898, 305368, 351538, 402750, 459358, 521728, 590238, 665278, 747250, 836568, 933658, 1038958 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A wazir is a leaper [0,1].

LINKS

Table of n, a(n) for n=1..38.

V. Kotesovec, Non-attacking chess pieces, 6ed, p.402

FORMULA

a(n) = n^2*(n^2-5)/2, n>=3.

G.f.: 2*x^2 * (2*x^5 - 9*x^4 + 15*x^3 - 9*x^2 - 4*x - 1)/(x-1)^5.

CROSSREFS

Cf. A172225, A201237, A201238, A201239, A201240, A201241, A201242.

Sequence in context: A343514 A070171 A172529 * A206623 A036800 A157052

Adjacent sequences:  A201233 A201234 A201235 * A201237 A201238 A201239

KEYWORD

nonn

AUTHOR

Vaclav Kotesovec, Nov 28 2011

STATUS

approved

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Last modified July 30 19:33 EDT 2021. Contains 346359 sequences. (Running on oeis4.)