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A234031 Number of (n+1) X (3+1) 0..4 arrays with every 2 X 2 subblock having the absolute values of all six edge and diagonal differences no larger than 1. 1
1543, 30263, 591711, 11637549, 229271097, 4522455227, 89286112307, 1763973731193, 34868594406281, 689542829566223, 13640600287798095, 269910850141570569, 5341921598774700885, 105741580472088580363 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A234036.
LINKS
FORMULA
Empirical: a(n) = 41*a(n-1) -473*a(n-2) +378*a(n-3) +15090*a(n-4) -24456*a(n-5) -191256*a(n-6) +160111*a(n-7) +1124270*a(n-8) +180876*a(n-9) -2156866*a(n-10) -1359614*a(n-11) +738304*a(n-12) +501820*a(n-13) -106672*a(n-14) -46728*a(n-15) +7920*a(n-16).
EXAMPLE
Some solutions for n=2
..3..2..3..3....1..2..2..3....2..2..2..1....4..4..3..2....0..1..2..1
..2..2..2..3....1..2..2..2....2..1..2..1....4..3..3..2....1..1..1..2
..3..2..3..3....1..1..2..1....1..1..2..1....3..4..3..2....0..1..2..1
CROSSREFS
Cf. A234036.
Sequence in context: A252966 A133560 A232102 * A038009 A362507 A249008
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 18 2013
STATUS
approved

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Last modified July 18 10:00 EDT 2024. Contains 374378 sequences. (Running on oeis4.)