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A251351 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock summing to 3 4 or 5 8
51, 309, 309, 1899, 3921, 1899, 11709, 50831, 50831, 11709, 72243, 663307, 1401453, 663307, 72243, 445797, 8671957, 39019417, 39019417, 8671957, 445797, 2751003, 113445117, 1089569635, 2324761359, 1089569635, 113445117, 2751003, 16976493 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Table starts
.....51.......309........1899.........11709............72243.............445797
....309......3921.......50831........663307..........8671957..........113445117
...1899.....50831.....1401453......39019417.......1089569635........30455338423
..11709....663307....39019417....2324761359.....139048718681......8328173688589
..72243...8671957..1089569635..139048718681...17831423507215...2290637311033759
.445797.113445117.30455338423.8328173688589.2290637311033759.631348219277725029
LINKS
FORMULA
Empirical for column k:
k=1: a(n) = 6*a(n-1) +3*a(n-2) -12*a(n-3)
k=2: [order 7]
k=3: [order 21]
k=4: [order 60]
EXAMPLE
Some solutions for n=2 k=4
..0..0..1..1..2....0..1..1..0..1....0..1..1..2..1....0..0..1..2..1
..2..1..2..1..1....1..1..2..2..1....2..0..2..0..2....2..2..2..0..0
..0..2..0..1..1....2..0..0..0..1....1..2..0..2..1....1..0..0..2..1
CROSSREFS
Sequence in context: A253921 A204956 A243462 * A251344 A245362 A219145
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 01 2014
STATUS
approved

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Last modified May 23 22:02 EDT 2024. Contains 372765 sequences. (Running on oeis4.)