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A198904 Number of nX6 0..4 arrays with values 0..4 introduced in row major order and no element equal to any horizontal or vertical neighbor 2
51, 62004, 89793204, 130292546801, 189062985604305, 274342896958292170, 398089706066811447174, 577654521153750977585383, 838214957290859115489996817, 1216305402162613228248847610489 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A198906

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..100

FORMULA

Empirical: a(n) = 1941*a(n-1) -806387*a(n-2) +148087843*a(n-3) -14409929271*a(n-4) +778094676063*a(n-5) -21816737058431*a(n-6) +172301552678113*a(n-7) +7343185920165785*a(n-8) -245567930834154099*a(n-9) +3173967512676632848*a(n-10) -15227320856420081570*a(n-11) -91185217544269175883*a(n-12) +1851754850894045611993*a(n-13) -13021262413927953929580*a(n-14) +53026970301996239080604*a(n-15) -137791962761820102384680*a(n-16) +234523646685947458039624*a(n-17) -259529910793881853229984*a(n-18) +179240545997964052307808*a(n-19) -69895831119161489802880*a(n-20) +11699525896373883270144*a(n-21)

EXAMPLE

Some solutions with values 0 to 4 for n=4

..0..1..0..2..3..4....0..1..0..2..0..3....0..1..0..2..3..0....0..1..0..2..0..3

..1..0..1..0..2..1....1..0..1..0..3..2....1..0..1..0..4..3....1..0..1..0..3..0

..0..1..0..2..1..4....0..1..0..3..4..0....0..1..0..2..3..1....0..1..0..3..0..1

..1..0..1..4..2..0....1..0..1..2..1..4....1..0..1..0..2..0....1..0..1..4..1..4

CROSSREFS

Sequence in context: A208198 A208405 A208412 * A238567 A198251 A135531

Adjacent sequences:  A198901 A198902 A198903 * A198905 A198906 A198907

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 31 2011

STATUS

approved

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Last modified June 27 22:27 EDT 2022. Contains 354899 sequences. (Running on oeis4.)