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A237911 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 7
256, 1780, 1780, 12552, 22128, 12552, 88544, 271292, 271292, 88544, 635200, 3324618, 5802892, 3324618, 635200, 4438816, 40005364, 117244060, 117244060, 40005364, 4438816, 31507328, 490622010, 2545423850, 4562312788, 2545423850 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Table starts
.......256........1780..........12552.............88544..............635200
......1780.......22128.........271292...........3324618............40005364
.....12552......271292........5802892.........117244060..........2545423850
.....88544.....3324618......117244060........4562312788........184156121060
....635200....40005364.....2545423850......184156121060......14526116666620
...4438816...490622010....54765533116.....7708485009320....1097530057048636
..31507328..6035315040..1229739987068...311133242528216...87005840880652470
.221652256.73714662652.25859231001772.12673056415040032.6730336129491899232
LINKS
FORMULA
Empirical for column k:
k=1: [linear recurrence of order 16] for n>17
k=2: [order 46]
EXAMPLE
Some solutions for n=2 k=4
..1..1..2..0..1....1..1..2..0..1....1..0..1..0..2....1..0..3..0..1
..0..3..0..0..0....0..0..1..2..0....3..0..0..1..3....2..3..2..1..1
..2..0..1..0..0....2..3..3..0..2....0..0..2..1..3....3..2..1..2..1
CROSSREFS
Sequence in context: A205944 A238306 A205937 * A237905 A238145 A238140
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Feb 15 2014
STATUS
approved

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Last modified June 19 23:45 EDT 2024. Contains 373510 sequences. (Running on oeis4.)