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A204147 Number of (n+2)X4 0..2 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order 1
3902, 28982, 156494, 891662, 5117114, 29610374, 169527242, 970408838, 5556457154, 31877275262, 182767466954, 1047729630038, 6004794957602, 34422401233838, 197325074405594, 1131174528105062, 6484208526471314 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A204153

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +9*a(n-2) -16*a(n-3) +162*a(n-4) -70*a(n-5) -704*a(n-6) -1224*a(n-7) -576*a(n-8) +4240*a(n-9) +11456*a(n-10) -6560*a(n-11) -14144*a(n-12) +5376*a(n-13) -7168*a(n-14) +13312*a(n-15) -4096*a(n-16) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A247691 A242873 A135202 * A252138 A115468 A066386

Adjacent sequences:  A204144 A204145 A204146 * A204148 A204149 A204150

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 11 2012

STATUS

approved

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Last modified April 17 01:26 EDT 2021. Contains 343051 sequences. (Running on oeis4.)