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A259294
Number of (n+1)X(5+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0001 0101 or 0111
1
434, 3938, 31774, 273686, 2293928, 19528726, 165147350, 1402044186, 11882217182, 100805628896, 854788219326, 7250421894706, 61489557032118, 521532393880894, 4423217189081992, 37515428883279070, 318180075628925406
OFFSET
1,1
COMMENTS
Column 5 of A259297
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +94*a(n-2) -260*a(n-3) -3104*a(n-4) +6922*a(n-5) +48854*a(n-6) -94118*a(n-7) -411428*a(n-8) +687376*a(n-9) +1991983*a(n-10) -2792826*a(n-11) -5747356*a(n-12) +6404184*a(n-13) +9882208*a(n-14) -8117120*a(n-15) -9774592*a(n-16) +5218304*a(n-17) +5062656*a(n-18) -1310720*a(n-19) -1048576*a(n-20)
EXAMPLE
Some solutions for n=3
..0..1..0..1..0..1....1..0..1..1..1..0....1..1..0..0..1..0....0..1..1..1..1..0
..1..1..1..1..1..1....0..1..0..1..0..0....1..0..0..1..1..1....1..1..0..1..0..1
..1..0..1..0..1..0....1..0..1..0..1..0....0..0..1..1..0..1....1..0..1..1..1..0
..0..1..0..0..0..1....0..1..1..1..1..1....1..0..0..1..1..1....0..0..0..1..0..0
CROSSREFS
Sequence in context: A108785 A219033 A237386 * A050507 A145318 A054987
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 23 2015
STATUS
approved