OFFSET
1,2
COMMENTS
The grid has m rows and n columns.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..435
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)
EXAMPLE
Array begins:
================================================================
m\n| 1 2 3 4 5 6 7
---+------------------------------------------------------------
1 | 1 3 6 10 15 21 28 ...
2 | 1 7 28 88 245 639 1608 ...
3 | 1 17 144 920 5191 27651 143342 ...
4 | 1 41 730 9362 104989 1111283 11457514 ...
5 | 1 99 3692 94280 2075271 42972329 866126030 ...
6 | 1 239 18666 947760 40792921 1642690309 64270256276 ...
7 | 1 577 94384 9528128 801218515 62618577481 4741764527414 ...
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Andrew Howroyd, Jan 06 2023
STATUS
approved