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A203876 Number of (n+1)X7 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order 1
354295, 220541455, 137282971015, 85671438703075, 53482170255256135, 33391264599507183643, 20848169781599252276647, 13016855297041203353448907, 8127274916555574691563311815, 5074392066627029759870699634571 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A203878
LINKS
FORMULA
Empirical: a(n) = 679*a(n-1) -678*a(n-2) -22734242*a(n-3) +933140579*a(n-4) +155787014907*a(n-5) -8051016327620*a(n-6) -290807316124696*a(n-7) +19393915590207480*a(n-8) -42256736666853016*a(n-9) -8847432014178030560*a(n-10) +83507954113124940672*a(n-11) +1074868787162173623984*a(n-12) -16105881486499812890064*a(n-13) +14956375338761404032576*a(n-14) +524896293102578305429248*a(n-15) -2119130239859527520231424*a(n-16) +1594233946756949214802176*a(n-17)
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0..1....0..0..0..0..0..1..0....0..0..0..0..0..0..0
..2..1..1..1..3..2..3....1..2..1..3..2..1..3....1..2..3..2..1..1..2
..2..3..0..2..0..0..1....0..3..1..0..2..1..0....1..2..1..0..3..3..3
..0..1..1..3..3..2..1....0..3..1..3..3..1..3....1..2..1..2..1..2..0
..2..2..2..2..1..0..3....0..2..0..2..0..1..0....0..2..0..2..3..2..3
CROSSREFS
Sequence in context: A237411 A235980 A169806 * A233752 A238382 A236945
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 07 2012
STATUS
approved

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Last modified April 14 20:39 EDT 2024. Contains 371667 sequences. (Running on oeis4.)