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A201511 Number of ways to place n nonattacking wazirs on an n X n board. 11
1, 2, 22, 405, 10741, 368868, 15516804, 771464278, 44218721793, 2868879752822, 207739939478618, 16602826428818482, 1451305771147909684, 137715836041691050398, 14096224186664736126206, 1547966111897855935957132, 181519663430661533452513680, 22636566614411901986006002896 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Wazir is a leaper [0,1].

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 1..21 (terms a(11)-a(18) computed by Peter Tittmann)

V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p. 382.

Peter Tittmann, Polynomials of nxn Grid Graphs [broken link]

FORMULA

Asymptotics (Vaclav Kotesovec, Nov 29 2011): a(n) ~ n^(2n)/n!*exp(-5/2).

CROSSREFS

Cf. A172225, A172226, A172227, A172228, A178409, A201507, A201508, A201510.

Cf. A006506.

Sequence in context: A138463 A007842 A287595 * A264839 A241347 A163436

Adjacent sequences:  A201508 A201509 A201510 * A201512 A201513 A201514

KEYWORD

nonn,nice,hard

AUTHOR

Vaclav Kotesovec, Dec 02 2011

EXTENSIONS

a(19)-a(20) from Vaclav Kotesovec, Aug 30 2016

STATUS

approved

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Last modified July 27 15:49 EDT 2021. Contains 346308 sequences. (Running on oeis4.)