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A235416 T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise 3
256, 2400, 2400, 22500, 64848, 22500, 162000, 1826923, 1826923, 162000, 1166400, 37684700, 149643266, 37684700, 1166400, 7157160, 782294899, 9676094946, 9676094946, 782294899, 7157160, 43917129, 12863400296, 623604857055 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

........256..........2400............22500............162000............1166400

.......2400.........64848..........1826923..........37684700..........782294899

......22500.......1826923........149643266........9676094946.......623604857055

.....162000......37684700.......9676094946.....2164987528892....482514486123747

....1166400.....782294899.....623604857055...482514486123747.362765302632826610

....7157160...12863400296...32662713888028.90234375246775523

...43917129..211918008383.1724073736174640

..242230104.2916338598826

.1336048704

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..49

FORMULA

Empirical for column k:

k=1: [linear recurrence of order 40]

EXAMPLE

Some solutions for n=2 k=4

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

..3..0..2..0..0....2..0..3..0..1....1..0..2..0..0....2..0..0..0..1

..3..3..0..2..1....3..2..3..1..1....2..2..2..0..1....2..3..0..2..3

CROSSREFS

Column 1 is A204303

Sequence in context: A207300 A205020 A204309 * A235261 A236087 A204303

Adjacent sequences:  A235413 A235414 A235415 * A235417 A235418 A235419

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Jan 10 2014

STATUS

approved

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Last modified October 16 00:29 EDT 2021. Contains 348034 sequences. (Running on oeis4.)