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A236740 Number of (n+1)X(2+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal 1
267, 1411, 7377, 46377, 300555, 2045011, 14169625, 99629489, 705755971, 5023764027, 35858364929, 256373385609, 1834737940219, 13137840357827, 94106513217961, 674219636431201, 4830962111410931, 34617492449991691 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236746

LINKS

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

FORMULA

Empirical: a(n) = 17*a(n-1) -78*a(n-2) -142*a(n-3) +1902*a(n-4) -2258*a(n-5) -14868*a(n-6) +37484*a(n-7) +39431*a(n-8) -204023*a(n-9) +60026*a(n-10) +473554*a(n-11) -502900*a(n-12) -310088*a(n-13) +766120*a(n-14) -297584*a(n-15) -171072*a(n-16) +157120*a(n-17) -32640*a(n-18)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A232106 A049014 A186056 * A278382 A062037 A244194

Adjacent sequences:  A236737 A236738 A236739 * A236741 A236742 A236743

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 30 2014

STATUS

approved

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Last modified June 24 00:14 EDT 2021. Contains 345403 sequences. (Running on oeis4.)