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A206378 Number of (n+1)X4 0..3 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order 1
641, 25945, 1198601, 57656713, 2808967145, 137393517193, 6728546532521, 329641979105737, 16151593118685929, 791414923478310409, 38779131391953424169, 1900174398169760171593, 93108499268211138032489 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A206383

LINKS

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

FORMULA

Empirical: a(n) = 74*a(n-1) -1401*a(n-2) +9064*a(n-3) -21992*a(n-4) +21312*a(n-5) -7056*a(n-6)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A259997 A256806 A206164 * A229851 A268840 A230715

Adjacent sequences:  A206375 A206376 A206377 * A206379 A206380 A206381

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 07 2012

STATUS

approved

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Last modified August 3 14:55 EDT 2021. Contains 346438 sequences. (Running on oeis4.)