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A185473 Number of (n+2)X7 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order 1
79743, 594798, 3097348, 12990375, 46410729, 146203201, 416227164, 1090826214, 2669230399, 6166331968, 13566979728, 28628817088, 58271012854, 114931139131, 220496274283, 412754753755, 755824704746, 1356767769574, 2391691228097 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A185477

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = (1/2155681382400)*n^17

+ (47/697426329600)*n^16

+ (611/134120448000)*n^15

+ (33559/174356582400)*n^14

+ (189341/33210777600)*n^13

+ (178309/1277337600)*n^12

+ (147904279/44706816000)*n^11

+ (87015563/1219276800)*n^10

+ (11642696389/9754214400)*n^9

+ (69578815777/4877107200)*n^8

+ (3848584871/32256000)*n^7

+ (44384094767/63866880)*n^6

+ (247986427893683/87178291200)*n^5

+ (124742663704661/14529715200)*n^4

+ (1115145293971/58212000)*n^3

+ (2731472131849/100900800)*n^2

+ (9965552297/510510)*n

+ 1735

EXAMPLE

Some solutions for 4X7

..0..0..0..0..0..0..0....0..0..0..0..0..1..1....0..0..0..0..0..0..1

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

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

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

CROSSREFS

Sequence in context: A238177 A237172 A146324 * A235075 A229700 A112785

Adjacent sequences:  A185470 A185471 A185472 * A185474 A185475 A185476

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 2011

STATUS

approved

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Last modified July 6 02:58 EDT 2022. Contains 355108 sequences. (Running on oeis4.)