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A237301 Number of (n+1)X(1+1) 0..2 arrays with the upper median of every 2X2 subblock equal 1
81, 435, 2174, 11545, 61055, 326262, 1745153, 9357963, 50227854, 269885945, 1451322519, 7810753350, 42066630913, 226720598435, 1222759174366, 6599028303897, 35636883752111, 192571672161174, 1041238183574337 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237308

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -143*a(n-3) +79*a(n-4) +796*a(n-5) -292*a(n-6) -1760*a(n-7) +256*a(n-8) +1280*a(n-9)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A237391 A237385 A237308 * A237945 A237938 A017630

Adjacent sequences:  A237298 A237299 A237300 * A237302 A237303 A237304

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 06 2014

STATUS

approved

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Last modified January 22 07:31 EST 2022. Contains 350481 sequences. (Running on oeis4.)