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A269293
Number of 5Xn 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once.
1
1024, 314928, 43674876, 5306911092, 598478857956, 64538382287988, 6751724437907820, 691013309706097812, 69557358002931376452, 6911040753656957427300, 679500524238978108503340
OFFSET
1,1
COMMENTS
Row 5 of A269289.
LINKS
FORMULA
Empirical: a(n) = 262*a(n-1) -25913*a(n-2) +1271424*a(n-3) -36373480*a(n-4) +662028380*a(n-5) -8018113210*a(n-6) +65608158980*a(n-7) -356568260410*a(n-8) +1185405035940*a(n-9) -1609856308508*a(n-10) -4162483461884*a(n-11) +23709461283851*a(n-12) -40474763971218*a(n-13) +272846513475*a(n-14) +106799477038956*a(n-15) -171480164894532*a(n-16) +115612142099328*a(n-17) -29562621871104*a(n-18) for n>23
EXAMPLE
Some solutions for n=2
..0..1. .0..0. .1..0. .1..3. .1..3. .2..2. .2..0. .0..2. .0..1. .0..0
..3..3. .0..3. .1..0. .1..1. .2..2. .0..1. .2..3. .0..0. .2..0. .1..0
..1..0. .1..0. .2..2. .0..2. .3..2. .1..1. .2..2. .2..1. .1..3. .1..3
..0..0. .0..2. .2..0. .0..3. .3..0. .3..1. .3..2. .3..1. .1..0. .0..0
..2..2. .2..3. .1..2. .2..3. .0..0. .0..1. .2..1. .1..1. .1..1. .0..0
CROSSREFS
Cf. A269289.
Sequence in context: A224207 A017033 A017117 * A017213 A221092 A017321
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2016
STATUS
approved