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A205628 Number of 4X(n+1) 0..2 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..2 introduced in row major order 1
396, 2052, 13068, 94116, 708300, 5439324, 42094188, 327077484, 2547102732, 19867584972, 155171240076, 1213352429196, 9498114849804, 74428751347980, 583820737433100, 4583937157350924, 36024984866070540, 283374615043095564 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A205626

LINKS

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

FORMULA

Empirical: a(n) = 23*a(n-1) -174*a(n-2) +284*a(n-3) +2352*a(n-4) -10052*a(n-5) -1168*a(n-6) +65760*a(n-7) -78080*a(n-8) -116928*a(n-9) +255232*a(n-10) -49664*a(n-11) -116736*a(n-12) +49152*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A126078 A275171 A028299 * A203934 A203927 A205330

Adjacent sequences:  A205625 A205626 A205627 * A205629 A205630 A205631

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 29 2012

STATUS

approved

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Last modified May 20 08:03 EDT 2022. Contains 353852 sequences. (Running on oeis4.)