A236740 - OEIS

A236740

Number of (n+1)X(2+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock equal

267, 1411, 7377, 46377, 300555, 2045011, 14169625, 99629489, 705755971, 5023764027, 35858364929, 256373385609, 1834737940219, 13137840357827, 94106513217961, 674219636431201, 4830962111410931, 34617492449991691

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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