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A244088 Decimal expansion of 1/2+2/sqrt(13), a constant related to the asymptotic evaluation of the number of self-avoiding rook paths joining opposite corners on a 3 X n chessboard. 1
1, 0, 5, 4, 7, 0, 0, 1, 9, 6, 2, 2, 5, 2, 2, 9, 1, 2, 2, 0, 1, 8, 3, 4, 1, 7, 3, 3, 4, 5, 6, 9, 9, 9, 3, 7, 6, 3, 4, 6, 3, 5, 3, 3, 1, 9, 0, 5, 3, 1, 1, 4, 8, 0, 1, 9, 5, 5, 4, 5, 4, 3, 1, 6, 3, 4, 2, 6, 4, 1, 0, 6, 8, 9, 6, 8, 1, 5, 5, 4, 5, 3, 1, 0, 8, 4, 0, 2, 9, 3, 5, 6, 9, 5, 1, 5, 2, 4, 1, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 5.10.2 Rook paths on a chessboard, p. 334.

LINKS

Table of n, a(n) for n=1..100.

FORMULA

Asymptotic number of paths = p(k) ~ (1/2+2/sqrt(13)) * sqrt((3+sqrt(13))/2)^(2k), where k = n-1.

EXAMPLE

1.054700196225229122018341733456999376346353319...

MATHEMATICA

RealDigits[1/2 + 2/Sqrt[13], 10, 100] // First

CROSSREFS

Cf. A006192, A007764, A007786, A007787, A244089.

Sequence in context: A234745 A019124 A019323 * A020832 A246724 A199276

Adjacent sequences:  A244085 A244086 A244087 * A244089 A244090 A244091

KEYWORD

nonn,cons,walk

AUTHOR

Jean-Fran├žois Alcover, Jun 20 2014

STATUS

approved

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Last modified February 18 21:20 EST 2020. Contains 332028 sequences. (Running on oeis4.)