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A204567 Number of (n+1)X4 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order 1
256, 6112, 158981, 4220392, 112592256, 3007468553, 80358249724, 2147311723128, 57381098807117, 1533363080745712, 40975264290787104, 1094961088264570145, 29260089513854569828, 781902543548899924344, 20894385553758379097861 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A204572

LINKS

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

FORMULA

Empirical: a(n) = 41*a(n-1) -451*a(n-2) +2007*a(n-3) -4185*a(n-4) +4371*a(n-5) -2214*a(n-6) +432*a(n-7)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A113173 A223964 A195595 * A077072 A283339 A128698

Adjacent sequences: A204564 A204565 A204566 * A204568 A204569 A204570

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 16 2012

STATUS

approved

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Last modified November 26 17:30 EST 2022. Contains 358362 sequences. (Running on oeis4.)