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A237505 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
328, 1724, 9108, 50876, 284368, 1553960, 8478776, 46757986, 257959884, 1416477192, 7776398684, 42785177212, 235416777178, 1294039386286, 7112841515544, 39114977306998, 215104356057896, 1182657379537690 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A237511

LINKS

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

FORMULA

Empirical: a(n) = 51*a(n-3) +452*a(n-4) +957*a(n-5) +1876*a(n-6) -1653*a(n-7) -28721*a(n-8) -62762*a(n-9) -54279*a(n-10) +103874*a(n-11) +439699*a(n-12) +514519*a(n-13) +101483*a(n-14) -1040322*a(n-15) -1791750*a(n-16) -259805*a(n-17) +1006112*a(n-18) +1409914*a(n-19) +1597459*a(n-20) -244216*a(n-21) -1055715*a(n-22) -360036*a(n-23) -212913*a(n-24) -59275*a(n-25) -17332*a(n-26) -1418*a(n-27) -86*a(n-28) +8*a(n-29)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A126311 A097738 A239536 * A183848 A205251 A138078

Adjacent sequences:  A237502 A237503 A237504 * A237506 A237507 A237508

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 08 2014

STATUS

approved

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Last modified June 14 05:51 EDT 2021. Contains 345018 sequences. (Running on oeis4.)