|
|
A302274
|
|
Number of n X 4 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
|
|
2
|
|
|
2, 10, 29, 89, 353, 941, 3316, 12016, 34060, 120940, 415304, 1257949, 4395268, 14710881, 46444038, 159674287, 528683443, 1709740974, 5804427370, 19154720511, 62771586925, 211230338251, 697032878924, 2300170434527, 7695594400341
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical recurrence of order 72 (see link above)
|
|
EXAMPLE
|
Some solutions for n=5:
0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 0 1 1 1
1 0 0 1 1 0 1 0 1 1 0 1 1 1 0 0 0 0 1 0
0 1 0 1 1 0 1 0 1 0 1 0 0 1 0 0 0 0 0 0
0 0 1 1 0 1 0 1 1 1 1 1 0 0 1 0 1 1 0 1
0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|