|
|
A253531
|
|
Number of (n+1)X(6+1) 0..2 arrays with every 2X2 subblock antidiagonal maximum minus diagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal minimum nondecreasing vertically
|
|
1
|
|
|
85663, 176266, 327147, 949158, 1744459, 4292539, 8304638, 18590483, 37412196, 79632497, 161715507, 333968028, 674473122, 1366396447, 2737489031, 5482593881, 10922295848, 21751547857, 43229912120, 85944892631, 170816625840
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 10*a(n-1) -37*a(n-2) +42*a(n-3) +106*a(n-4) -388*a(n-5) +284*a(n-6) +632*a(n-7) -1382*a(n-8) +364*a(n-9) +1690*a(n-10) -1924*a(n-11) -208*a(n-12) +1808*a(n-13) -1076*a(n-14) -392*a(n-15) +751*a(n-16) -262*a(n-17) -93*a(n-18) +106*a(n-19) -34*a(n-20) +4*a(n-21) for n>42
|
|
EXAMPLE
|
Some solutions for n=2
..0..0..1..1..2..1..2....0..1..0..0..1..0..2....2..0..1..0..1..1..2
..0..0..0..0..1..0..2....1..2..1..0..2..0..2....2..1..1..0..0..0..0
..0..1..1..2..2..0..2....1..2..1..0..2..0..2....0..2..2..2..2..2..2
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|