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A204478 Number of (n+2)X5 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order 1
1157, 3147, 608, 1587, 2632, 9290, 34964, 124697, 471260, 1787757, 6755022, 25607122, 97087698, 368019431, 1395257904, 5289834511, 20055078524, 76034541226, 288268853192, 1092909563581, 4143534617092, 15709332458233 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A204483

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +a(n-2) -2*a(n-3) -19*a(n-4) -4*a(n-5) +21*a(n-6) +24*a(n-7) +3*a(n-8) -18*a(n-9) -9*a(n-10) for n>13

EXAMPLE

Some solutions for n=3

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

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

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

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

..3..1..1..1..0....2..0..2..2..2....3..1..0..0..2....3..3..3..3..3

CROSSREFS

Sequence in context: A264089 A264278 A217279 * A031746 A219148 A031532

Adjacent sequences:  A204475 A204476 A204477 * A204479 A204480 A204481

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified February 25 12:00 EST 2021. Contains 341606 sequences. (Running on oeis4.)