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A236731 Number of (n+1)X(2+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock equal 1
345, 2471, 17583, 131147, 975553, 7370761, 55873999, 426890075, 3275546533, 25261075001, 195543845671, 1519132794379, 11836226911325, 92460736346337, 723838052083423, 5677220879646115, 44597479303258101, 350802192747968425 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236737

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) -103*a(n-2) -358*a(n-3) +4749*a(n-4) -8438*a(n-5) -47573*a(n-6) +201166*a(n-7) -30204*a(n-8) -1074134*a(n-9) +1618940*a(n-10) +1364656*a(n-11) -5060624*a(n-12) +2241312*a(n-13) +4225728*a(n-14) -4631936*a(n-15) +436992*a(n-16) +1161216*a(n-17) -387072*a(n-18) -30720*a(n-19) +16384*a(n-20)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A095963 A247079 A333079 * A138043 A048904 A139266

Adjacent sequences:  A236728 A236729 A236730 * A236732 A236733 A236734

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 30 2014

STATUS

approved

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Last modified September 23 19:18 EDT 2020. Contains 337315 sequences. (Running on oeis4.)