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A163032 Number of nX6 binary arrays with all 1s connected and a path of 1s from top row to bottom row 1
21, 639, 27651, 1111283, 42972329, 1642690309, 62618577481, 2385542862643, 90870669971589, 3461426734215747 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..10.

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: A327681 A141265 A025752 * A209264 A012501 A027408

Adjacent sequences:  A163029 A163030 A163031 * A163033 A163034 A163035

KEYWORD

nonn,changed

AUTHOR

R. H. Hardin Jul 20 2009

STATUS

approved

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Last modified May 30 15:01 EDT 2020. Contains 334726 sequences. (Running on oeis4.)