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A317770
Number of nX5 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
8, 11, 16, 14, 19, 30, 42, 67, 100, 160, 248, 401, 630, 1025, 1615, 2605, 4136, 6726, 10725, 17402, 27961, 45514, 73224, 118990, 192065, 312212, 504293, 819526, 1326302, 2155198, 3489707, 5670411, 9190043, 14929192, 24203409, 39317022
OFFSET
1,1
COMMENTS
Column 5 of A317773.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +6*a(n-4) -4*a(n-5) +2*a(n-7) -11*a(n-8) +3*a(n-9) +9*a(n-10) -13*a(n-11) +5*a(n-12) -7*a(n-13) -24*a(n-14) +10*a(n-15) +7*a(n-16) +9*a(n-17) +17*a(n-18) -5*a(n-19) -8*a(n-20) +12*a(n-21) -a(n-22) +7*a(n-23) +3*a(n-24) -3*a(n-25) +7*a(n-26) +17*a(n-27) +4*a(n-28) -6*a(n-29) -11*a(n-30) -15*a(n-31) -7*a(n-32) -a(n-33) for n>41
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0
..0..0..0..0..1. .0..0..0..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..0..0
..0..0..0..0..0. .1..1..0..0..0. .0..0..0..0..0. .1..0..0..0..0
..0..0..0..0..0. .1..1..1..0..0. .0..0..0..0..0. .1..1..0..0..0
CROSSREFS
Cf. A317773.
Sequence in context: A256073 A032423 A063724 * A154685 A068591 A065348
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 06 2018
STATUS
approved