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A204569 Number of (n+1)X6 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
11448, 1075080, 112592256, 12184154082, 1331721926667, 146012317377342, 16024704563231697, 1759237470505955994, 193152837690597697122, 21207576736241661449097, 2328548082128091084529791 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A204572

LINKS

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

FORMULA

Empirical: a(n) = 179*a(n-1) -8908*a(n-2) +137964*a(n-3) +1149807*a(n-4) -62747265*a(n-5) +808434446*a(n-6) -4484318662*a(n-7) +3275499119*a(n-8) +100375182249*a(n-9) -615570345873*a(n-10) +1689825045573*a(n-11) -2021674602024*a(n-12) -928315208142*a(n-13) +6467936966622*a(n-14) -8574644356956*a(n-15) +3987231788124*a(n-16) +1799176026996*a(n-17) -3081486709152*a(n-18) +1405762064496*a(n-19) -228153998592*a(n-20)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A154064 A140922 A216363 * A023071 A349746 A100972

Adjacent sequences:  A204566 A204567 A204568 * A204570 A204571 A204572

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 16 2012

STATUS

approved

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Last modified June 28 21:04 EDT 2022. Contains 354907 sequences. (Running on oeis4.)