|
|
A224684
|
|
Number of (n+4)X6 0..1 matrices with each 5X5 subblock idempotent
|
|
1
|
|
|
2351, 1312, 1494, 1720, 1938, 2110, 2591, 3332, 4377, 5599, 6968, 8749, 11314, 14818, 19530, 25558, 33366, 43649, 57438, 75842, 100289, 132470, 174892, 231022, 305587, 404481, 535530, 708936, 938459, 1242445, 1645315, 2179125, 2886344, 3823000
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 2*a(n-1) -a(n-2) +a(n-3) -a(n-4) -a(n-7) +a(n-8) -a(n-9) +a(n-10) +a(n-12) -a(n-13) for n>18
|
|
EXAMPLE
|
Some solutions for n=2
..1..0..0..0..0..0....1..0..0..0..0..0....0..0..0..0..0..0....1..0..0..0..0..1
..1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....1..0..0..0..0..0
..0..0..0..0..0..0....0..1..0..0..1..0....0..0..0..0..0..0....1..0..0..0..0..1
..0..0..1..0..1..0....0..1..0..0..1..0....0..0..0..0..0..0....0..0..0..0..0..1
..0..0..1..0..1..0....0..1..0..0..1..0....0..0..0..1..1..1....0..0..0..0..0..1
..0..0..0..0..0..1....0..0..0..0..0..0....0..0..0..0..0..0....1..0..0..0..0..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|