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A163031 Number of nX5 binary arrays with all 1s connected and a path of 1s from top row to bottom row 2
15, 245, 5191, 104989, 2075271, 40792921, 801218515, 15736428305, 309080891641, 6070750256417, 119237718452471, 2341990743046197, 45999883370408813, 903500281246849523, 17745974522766912147, 348555078644003475079 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n=1..21

Chaim Goodman-Strauss, Notes on the number of m × n binary arrays with all 1’s connected and a path of 1’s from top row to bottom row (May 21 2020)

Chaim Goodman-Strauss, Mma notebook to accompany the above document

FORMULA

For a formula see the Goodman-Strauss links. - N. J. A. Sloane, May 22 2020

CROSSREFS

Cf. A163029-A163036.

Sequence in context: A059760 A059615 A215855 * A065920 A273624 A223424

Adjacent sequences:  A163028 A163029 A163030 * A163032 A163033 A163034

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 20 2009

STATUS

approved

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Last modified March 8 22:53 EST 2021. Contains 341959 sequences. (Running on oeis4.)