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A204147
Number of (n+2) X 4 0..2 arrays with every 3 X 3 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
OFFSET
1,1
COMMENTS
Column 2 of A204153.
LINKS
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
Cf. A204153.
Sequence in context: A242873 A377773 A135202 * A252138 A115468 A066386
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 11 2012
STATUS
approved