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A240779 Number of nX4 0..1 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..1 introduced in row major order 1
1, 6, 46, 305, 2167, 15332, 108509, 767834, 5434887, 38467875, 272273018, 1927138748, 13640213436, 96544878838, 683340799760, 4836658942731, 34233678967243, 242304613789940, 1715022389014131, 12138860042126682 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A240783

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +2*a(n-2) -7*a(n-3) -25*a(n-4) -6*a(n-5) +150*a(n-6) +12*a(n-7) -456*a(n-8) -134*a(n-9) +408*a(n-10) +116*a(n-11) -171*a(n-12) +73*a(n-13) +388*a(n-14) +87*a(n-15) -127*a(n-16) -168*a(n-17) -62*a(n-18) -12*a(n-19) +16*a(n-20) +8*a(n-21) +2*a(n-22)

EXAMPLE

Some solutions for n=4

..0..0..1..0....0..1..1..0....0..1..0..1....0..1..0..0....0..1..0..1

..0..0..1..0....1..1..1..0....0..0..1..1....1..1..0..0....1..0..0..1

..0..1..0..1....1..1..0..1....1..0..1..1....1..1..0..0....1..0..1..1

..0..1..0..1....1..0..1..0....1..0..1..0....0..1..0..1....1..0..1..1

CROSSREFS

Sequence in context: A079910 A103768 A325947 * A073507 A155598 A190005

Adjacent sequences:  A240776 A240777 A240778 * A240780 A240781 A240782

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 12 2014

STATUS

approved

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Last modified June 15 14:55 EDT 2021. Contains 345049 sequences. (Running on oeis4.)