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A203833 Number of (n+1)X7 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
140625, 11669859, 1043088057, 95763046491, 8882824128417, 827309554361235, 77176081545485769, 7204002753036584331, 672627208587089667633, 62808488037897381676611, 5865153683164077390051033 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A203835

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 117*a(n-1) -614*a(n-2) -193608*a(n-3) +4171896*a(n-4) +11415328*a(n-5) -842180224*a(n-6) +3384845504*a(n-7) +50528534400*a(n-8) -356768428544*a(n-9) -786566761984*a(n-10) +10681051645952*a(n-11) -6785526038528*a(n-12) -118510105321472*a(n-13) +197530250887168*a(n-14) +559297782349824*a(n-15) -1309510355714048*a(n-16) -1087672042455040*a(n-17) +3564507406925824*a(n-18) +719985279238144*a(n-19) -4461650060509184*a(n-20) +91947477762048*a(n-21) +2549613680656384*a(n-22) -206006306996224*a(n-23) -619282299879424*a(n-24) +65421579386880*a(n-25) +47138239152128*a(n-26) -8245531901952*a(n-27) +260919263232*a(n-28)

EXAMPLE

Some solutions for n=4

..0..2..0..1..2..2..1....1..2..2..1..2..2..1....2..2..1..1..1..1..0

..1..0..2..0..1..2..2....0..1..2..2..1..2..2....0..2..2..1..1..1..1

..2..1..0..2..0..1..2....1..2..2..2..2..2..1....2..1..2..2..1..1..0

..2..2..1..0..2..0..1....1..1..2..0..2..1..2....1..0..1..2..2..1..1

..1..2..2..1..0..2..0....2..1..1..2..2..2..2....2..1..1..1..2..2..1

CROSSREFS

Sequence in context: A036527 A250570 A252017 * A032747 A212373 A195438

Adjacent sequences:  A203830 A203831 A203832 * A203834 A203835 A203836

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2012

STATUS

approved

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Last modified August 11 18:17 EDT 2020. Contains 336428 sequences. (Running on oeis4.)