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A237940 Number of (n+1)X(3+1) 0..2 arrays with the maximum minus the minimum of every 2X2 subblock equal 1
2417, 70435, 2020033, 61286941, 1871339377, 57597474709, 1776214151413, 54843034007201, 1694040467293129, 52337670706589013, 1617105631658587709, 49966343554172921017, 1543913100962144403457, 47705757467460910288829 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A237945

LINKS

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

FORMULA

Empirical: a(n) = 39*a(n-1) -58*a(n-2) -7030*a(n-3) +21065*a(n-4) +435029*a(n-5) -1133100*a(n-6) -11041734*a(n-7) +26665646*a(n-8) +125943418*a(n-9) -291658456*a(n-10) -685365122*a(n-11) +1522606472*a(n-12) +1905197584*a(n-13) -4027531552*a(n-14) -2766833480*a(n-15) +5675870464*a(n-16) +1922313440*a(n-17) -4271600256*a(n-18) -377080192*a(n-19) +1576797696*a(n-20) -161140224*a(n-21) -210014208*a(n-22) +47554560*a(n-23)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A234126 A159346 A256835 * A097030 A204367 A131759

Adjacent sequences:  A237937 A237938 A237939 * A237941 A237942 A237943

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2014

STATUS

approved

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Last modified October 15 05:09 EDT 2018. Contains 316202 sequences. (Running on oeis4.)