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A208411 Number of 4Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors 1
15, 2795, 667478, 163422914, 40039156736, 9810325806914, 2403711876698218, 588954110860577394, 144304709913279198696, 35357337571782719886214, 8663205247528271356492160, 2122646395773319892200238358 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A208408

LINKS

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

FORMULA

Empirical: a(n) = 226*a(n-1) +4747*a(n-2) -18294*a(n-3) -739509*a(n-4) -1661510*a(n-5) +17227605*a(n-6) +10151090*a(n-7) -98711047*a(n-8) -11588022*a(n-9) +195980121*a(n-10) -44074854*a(n-11) -121060656*a(n-12) +71173728*a(n-13) -10077696*a(n-14) for n>16

EXAMPLE

Some solutions for n=4

..0..0..0..1....0..1..0..0....0..1..1..1....0..0..0..0....0..0..0..1

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

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

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

CROSSREFS

Sequence in context: A208197 A232407 A208404 * A249965 A108281 A232455

Adjacent sequences:  A208408 A208409 A208410 * A208412 A208413 A208414

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 26 2012

STATUS

approved

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Last modified October 7 15:55 EDT 2022. Contains 357275 sequences. (Running on oeis4.)