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A212269 Number of ways to place k non-attacking kings on an n X n cylindrical chessboard, summed over all k >= 0. 6
2, 5, 19, 205, 3011, 92875, 4763459, 459630701, 78223965193, 24270274906085, 13497818986883771, 13571363009654254429, 24562890586806439035377, 80199120146273882569630015, 471874707649862024071657639861, 5005895207027974222377733802848093 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

S. R. Finch, Mathematical Constants, Cambridge, 2003, p. 343.

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 1..26

V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p.165

FORMULA

Limit n ->infinity (a(n))^(1/n^2) = 1.342643951124... (see A247413).

CROSSREFS

Cf. A063443(n+1), A067958, A194650-A194654, A182407, A247413, A212269.

Sequence in context: A193674 A085871 A202422 * A080280 A218386 A055813

Adjacent sequences:  A212266 A212267 A212268 * A212270 A212271 A212272

KEYWORD

nonn,hard

AUTHOR

Vaclav Kotesovec, May 12 2012

STATUS

approved

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Last modified September 22 12:59 EDT 2019. Contains 327307 sequences. (Running on oeis4.)