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A204636 Number of (n+2)X4 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..3 introduced in row major order 1
405, 1884, 5974, 379, 1860, 2239, 8140, 32206, 107738, 407469, 1548886, 5829163, 22096946, 83787824, 317534026, 1203852903, 4564187472, 17303757255, 65603491248, 248721817370, 942974820890, 3575088864265, 13554191235794 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A204642

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

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

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

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

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

CROSSREFS

Sequence in context: A169904 A267893 A151745 * A224527 A219147 A239541

Adjacent sequences:  A204633 A204634 A204635 * A204637 A204638 A204639

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 2012

STATUS

approved

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Last modified January 21 01:45 EST 2022. Contains 350473 sequences. (Running on oeis4.)