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A233870 Number of (n+1)X(2+1) 0..7 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 21 1
1176, 5404, 26488, 155104, 909408, 5878272, 36964980, 249710396, 1622032500, 11215026376, 74076824924, 518810087196, 3457277192904, 24385605821656, 163265938186764, 1156012704135280, 7758896886604512, 55050635581902056 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A233875
LINKS
FORMULA
Empirical recurrence of order 71 (see link above)
EXAMPLE
Some solutions for n=4
..2..5..2....6..1..7....6..3..1....6..6..3....6..0..6....0..3..7....0..3..6
..1..7..1....7..3..6....0..6..7....7..0..6....7..6..7....7..3..0....0..6..0
..1..4..7....1..6..0....3..6..0....2..2..5....6..0..6....3..0..6....7..6..3
..1..7..1....4..0..3....1..7..6....7..0..6....7..6..3....7..3..0....0..6..0
..0..1..0....4..7..3....6..3..1....3..3..0....3..1..7....3..0..6....3..6..3
CROSSREFS
Sequence in context: A027485 A204755 A202199 * A237774 A223340 A270147
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2013
STATUS
approved

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Last modified April 13 04:33 EDT 2024. Contains 371639 sequences. (Running on oeis4.)