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A206172 Number of 4X(n+1) 0..3 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..3 introduced in row major order 1
870, 17142, 463878, 13899222, 431954406, 13703317686, 440473683078, 14283616280598, 465930004254822, 15258594360495222, 501007066854539526, 16478709230048972886, 542620670913354491622, 17881085207300419763766 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A206169

LINKS

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

FORMULA

Empirical: a(n) = 69*a(n-1) -1494*a(n-2) +9190*a(n-3) +49137*a(n-4) -662493*a(n-5) +655164*a(n-6) +11804292*a(n-7) -31347567*a(n-8) -49939173*a(n-9) +213341850*a(n-10) -92654442*a(n-11) -92175489*a(n-12) +40920957*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

..1..2..1..2..0....1..0..1..0..1....3..1..3..1..3....1..1..0..1..2

..3..2..0..2..1....1..1..3..1..1....0..3..0..3..2....0..2..2..1..2

CROSSREFS

Sequence in context: A165377 A283449 A158669 * A205426 A035855 A317806

Adjacent sequences:  A206169 A206170 A206171 * A206173 A206174 A206175

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 04 2012

STATUS

approved

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Last modified January 23 03:15 EST 2022. Contains 350504 sequences. (Running on oeis4.)