The On-Line Encyclopedia of Integer Sequences (OEIS)

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A278408

Number of nX2 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.
(history; published version)

#5 by R. H. Hardin at Mon Nov 21 09:03:50 EST 2016

STATUS

editing

approved

#4 by R. H. Hardin at Mon Nov 21 09:03:46 EST 2016

LINKS

R. H. Hardin, <a href="/A278408/b278408.txt">Table of n, a(n) for n = 1..210</a>

R. H. Hardin, <a href="/A278408/a278408.txt">Empirical polynomial of degree 26</a>

#3 by R. H. Hardin at Mon Nov 21 09:02:46 EST 2016

NAME

allocated for R. H. Hardin

Number of nX2 0..2 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.

DATA

0, 20, 264, 2550, 22267, 166762, 1046418, 5586207, 25997719, 107862842, 406276442, 1409360487, 4554092377, 13832291491, 39781304005, 108983918717, 285829839116, 720662237189, 1752986235171, 4126404034476, 9424479791691, 20933182989114

OFFSET

1,2

COMMENTS

Column 2 of A278414.

FORMULA

Empirical polynomial of degree 26 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A278414.

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin, Nov 21 2016

STATUS

approved

editing

#2 by R. H. Hardin at Mon Nov 21 08:59:17 EST 2016

KEYWORD

allocating

allocated

#1 by R. H. Hardin at Mon Nov 21 08:59:17 EST 2016

NAME

allocated for R. H. Hardin

KEYWORD

allocating

STATUS

approved