|
| |
|
|
A183972
|
|
Half the number of (n+1)X2 0..3 arrays with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one
|
|
1
|
|
|
|
128, 992, 7688, 64976, 549152, 4780976, 41623688, 366310352, 3223723808, 28480830608, 251621342408, 2226098835920, 19694339040800, 174322195009040, 1542993019964552, 13660022569173968, 120931341993127712
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
|
|
|
LINKS
|
|
|
|
FORMULA
|
Empirical: a(n)=10*a(n-1)-96*a(n-3)+669*a(n-4)-6162*a(n-5)+3936*a(n-6)+20976*a(n-7)-24228*a(n-8)+291240*a(n-9)-94464*a(n-10)-1024704*a(n-11)+385344*a(n-12)-24192*a(n-13)+912384*a(n-15)-331776*a(n-16)
|
|
|
EXAMPLE
|
Some solutions for 3X2
..0..2....1..1....2..0....2..2....0..1....3..1....3..0....3..3....0..1....1..2
..2..0....0..0....0..2....3..2....2..3....3..1....3..0....1..2....1..2....1..3
..1..2....0..3....1..1....3..2....0..2....3..1....1..2....3..2....0..1....1..1
...
...4.......2.......4.......9.......6.......8.......6.......9.......4.......7...
...5.......3.......4......10.......7.......8.......6.......8.......4.......6...
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
