|
|
A236740
|
|
Number of (n+1)X(2+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal
|
|
1
|
|
|
267, 1411, 7377, 46377, 300555, 2045011, 14169625, 99629489, 705755971, 5023764027, 35858364929, 256373385609, 1834737940219, 13137840357827, 94106513217961, 674219636431201, 4830962111410931, 34617492449991691
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 17*a(n-1) -78*a(n-2) -142*a(n-3) +1902*a(n-4) -2258*a(n-5) -14868*a(n-6) +37484*a(n-7) +39431*a(n-8) -204023*a(n-9) +60026*a(n-10) +473554*a(n-11) -502900*a(n-12) -310088*a(n-13) +766120*a(n-14) -297584*a(n-15) -171072*a(n-16) +157120*a(n-17) -32640*a(n-18)
|
|
EXAMPLE
|
Some solutions for n=4
..1..1..0....1..1..0....1..1..2....0..1..2....2..0..1....1..0..2....2..1..0
..1..2..1....1..1..1....1..1..1....2..1..0....0..0..0....0..1..0....1..1..2
..0..1..1....1..1..2....0..1..1....1..1..1....2..0..0....0..2..0....1..1..0
..1..1..2....2..0..1....1..1..1....1..2..1....0..0..0....0..1..0....1..1..1
..2..1..1....1..1..2....1..2..1....0..1..1....0..0..0....2..0..2....2..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|