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A265480 T(n,k)=Number of nXk 0..n+k-2 arrays with upper left zero and lower right n+k-2 and each element differing from its diagonal and antidiagonal neighbors by one or two. 8
1, 1, 1, 3, 6, 3, 16, 36, 36, 16, 125, 366, 1376, 366, 125, 1296, 4900, 32400, 32400, 4900, 1296, 16807, 55800, 498520, 1211112, 498520, 55800, 16807, 262144, 970225, 26904969, 128323584, 128323584, 26904969, 970225, 262144, 4782969, 11095448 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
Table starts
.....1......1.........3...........16............125...............1296
.....1......6........36..........366...........4900..............55800
.....3.....36......1376........32400.........498520...........26904969
....16....366.....32400......1211112......128323584.........3120703104
...125...4900....498520....128323584.....4131348480......3136398496144
..1296..55800..26904969...3120703104..3136398496144.....49965944917500
.16807.970225.316565600.589329511684.63552226862294.425344798130083225
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..5..4..3....0..3..3..5....0..2..0..4....0..5..0..5....0..2..3..5
..3..2..4..2....1..2..4..4....3..1..3..2....3..2..3..1....4..2..3..2
..4..5..1..5....4..3..3..5....2..2..0..5....0..4..0..5....3..5..4..5
CROSSREFS
Column 1 is A000272.
Sequence in context: A205865 A362585 A085881 * A309084 A288092 A127574
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 09 2015
STATUS
approved

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Last modified June 23 03:01 EDT 2024. Contains 373629 sequences. (Running on oeis4.)