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A235421 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise 8
81, 432, 432, 2304, 5022, 2304, 9504, 60879, 60231, 9504, 39204, 543946, 1607343, 533868, 39204, 138402, 4895505, 33361964, 33411901, 4740889, 138402, 488601, 35230388, 681329430, 1782209164, 692896087, 33788761, 488601, 1553877 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

.......81........432..........2304............9504............39204

......432.......5022.........60879..........543946..........4895505

.....2304......60231.......1607343........33361964........681329430

.....9504.....533868......33411901......1782209164......93548701107

....39204....4740889.....692896087.....94717997107...12393951158079

...138402...33788761...11682620720...4225274664375.1468687449529994

...488601..241566875..200551110843.190528055285203

..1553877.1459008798.2871917717259

..4941729.8848965583

.14587326

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60

FORMULA

Empirical for column 1 and row 1:

[same linear recurrence of order 26]

EXAMPLE

Some solutions for n=2 k=4

..2..0..0..0..0....0..2..2..0..0....2..0..1..0..0....1..0..2..0..2

..2..1..0..0..0....2..1..0..0..1....2..0..2..0..2....2..1..1..0..0

..2..0..1..0..1....2..1..0..0..2....2..1..1..0..2....0..2..0..0..2

CROSSREFS

Sequence in context: A236704 A236604 A236698 * A236282 A235417 A237391

Adjacent sequences:  A235418 A235419 A235420 * A235422 A235423 A235424

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Jan 10 2014

STATUS

approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)