login
A268627
Number of nX7 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.
1
768, 29646, 982086, 30553014, 915847266, 26758514760, 767057092212, 21665715966234, 604770363515718, 16719464029955466, 458539471622171262, 12491032205839395768, 338309651358216576312, 9117289065936178169226
OFFSET
1,1
COMMENTS
Column 7 of A268628.
LINKS
FORMULA
Empirical: a(n) = 110*a(n-1) -5243*a(n-2) +144650*a(n-3) -2610593*a(n-4) +33017408*a(n-5) -305811128*a(n-6) +2137462184*a(n-7) -11513372884*a(n-8) +48502300256*a(n-9) -161412354008*a(n-10) +427044616576*a(n-11) -901108804624*a(n-12) +1517344261024*a(n-13) -2035022988048*a(n-14) +2164824966496*a(n-15) -1815145078160*a(n-16) +1189730382208*a(n-17) -603502277248*a(n-18) +234173991424*a(n-19) -68574152448*a(n-20) +14906358784*a(n-21) -2352277504*a(n-22) +260550656*a(n-23) -19140608*a(n-24) +835584*a(n-25) -16384*a(n-26)
EXAMPLE
Some solutions for n=2
..0..0..1..0..0..0..1. .1..0..0..1..0..0..0. .0..0..1..0..0..0..2
..0..1..0..0..1..0..1. .0..1..1..2..1..0..1. .0..1..0..0..0..0..1
CROSSREFS
Cf. A268628.
Sequence in context: A183687 A269051 A282287 * A170783 A268970 A339763
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2016
STATUS
approved