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A240639 Number of nX4 0..3 arrays with no element equal to one or three horizontal or vertical neighbors, with new values 0..3 introduced in row major order 1
5, 193, 7993, 333308, 13897353, 579476701, 24162243789, 1007486056500, 42008844856285, 1751630302786777, 73037207055319249, 3045410673315147020, 126983581950165639585, 5294796602205290417269, 220775557186425817150245 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A240642

LINKS

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

FORMULA

Empirical: a(n) = 38*a(n-1) +193*a(n-2) -1416*a(n-3) -7253*a(n-4) -47234*a(n-5) -212251*a(n-6) -820896*a(n-7) -1101555*a(n-8) +3235842*a(n-9) +4995027*a(n-10) +822312*a(n-11) +1108809*a(n-12) -3188646*a(n-13) -4782969*a(n-14)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A177192 A100760 A240702 * A198482 A198523 A093154

Adjacent sequences:  A240636 A240637 A240638 * A240640 A240641 A240642

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2014

STATUS

approved

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Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)