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A198979 Number of nX5 0..5 arrays with values 0..5 introduced in row major order and no element equal to any horizontal or vertical neighbor 2
15, 8731, 12662226, 19622872903, 30525244435834, 47495195899845037, 73900197917712351603, 114985169155743145765664, 178911424288565716160545667, 278377620790460864731769016202 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A198982

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..118

FORMULA

Empirical: a(n) = 1919*a(n-1) -618345*a(n-2) +87289985*a(n-3) -6569574565*a(n-4) +278610016111*a(n-5) -6494675901838*a(n-6) +68671059116490*a(n-7) +172591767439289*a(n-8) -13348281831215275*a(n-9) +160607442902203491*a(n-10) -980646097424848279*a(n-11) +3301315800351613573*a(n-12) -5146582047324378787*a(n-13) -2530332306059747340*a(n-14) +26669206285409451180*a(n-15) -51683930686978851864*a(n-16) +51325265833875086656*a(n-17) -28242314477005082400*a(n-18) +8055054564912000000*a(n-19) -914531071104000000*a(n-20)

EXAMPLE

Some solutions with all values from 0 to 5 for n=4

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

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

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

..3..0..4..0..5....3..0..4..1..5....3..0..4..5..1....3..0..3..2..5

CROSSREFS

Sequence in context: A206295 A074488 A059950 * A249967 A308156 A304397

Adjacent sequences:  A198976 A198977 A198978 * A198980 A198981 A198982

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 01 2011

STATUS

approved

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Last modified September 21 12:54 EDT 2021. Contains 347598 sequences. (Running on oeis4.)