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A278634 T(n,k)=Number of nXk 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly two mistakes. 7
0, 0, 0, 1, 13, 1, 15, 285, 285, 15, 90, 3354, 10824, 3354, 90, 357, 27521, 234484, 234484, 27521, 357, 1107, 175881, 3739008, 10776210, 3739008, 175881, 1107, 2907, 932205, 48592635, 387551595, 387551595, 48592635, 932205, 2907, 6765, 4266912 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Table starts

....0.......0..........1............15................90..................357

....0......13........285..........3354.............27521...............175881

....1.....285......10824........234484...........3739008.............48592635

...15....3354.....234484......10776210.........387551595..........11719632199

...90...27521....3739008.....387551595.......33967584488........2593097277036

..357..175881...48592635...11719632199.....2593097277036......521528860552802

.1107..932205..541463431..309971214338...175644502146694....94782697883923436

.2907.4266912.5325263364.7350438329498.10734760074025367.15624069731088285787

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..127

FORMULA

Empirical for column k:

k=1: [polynomial of degree 8]

k=2: [polynomial of degree 24]

k=3: [polynomial of degree 70]

EXAMPLE

Some solutions for n=3 k=4

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

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

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

CROSSREFS

Column 1 is A005716(n+1).

Sequence in context: A010236 A058018 A037283 * A306507 A094709 A236231

Adjacent sequences:  A278631 A278632 A278633 * A278635 A278636 A278637

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Nov 24 2016

STATUS

approved

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Last modified January 21 06:26 EST 2022. Contains 350473 sequences. (Running on oeis4.)