A163031 Number of n X 5 binary arrays with all 1s connected and a path of 1s from top row to bottom row.

15, 245, 5191, 104989, 2075271, 40792921, 801218515, 15736428305, 309080891641, 6070750256417, 119237718452471, 2341990743046197, 45999883370408813, 903500281246849523, 17745974522766912147, 348555078644003475079

Offset: 1

Author

R. H. Hardin, Jul 20 2009

Keywords

• nonn

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

Crossrefs

Column 5 of A359574.

Cf. A163029-A163036.

Formula

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