login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A252128 Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 4 6 or 7 1
9640, 120600, 1322632, 2564965, 40402457, 515273273, 913218432, 16209952502, 217606042342, 371233200163, 6917437951509, 94517054463531, 159125805610601, 3015930049335889, 41457570098721225, 69486855759107968 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A252130

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 868*a(n-3) -251338*a(n-6) +31303314*a(n-9) -1562355495*a(n-12) +2667902050*a(n-15) +2036001452078*a(n-18) -50897333534826*a(n-21) +1045745304494*a(n-24) +13432920968609832*a(n-27) -136088426542191312*a(n-30) -394138046120818142*a(n-33) +13117896306127882288*a(n-36) -56673653102170010414*a(n-39) -171489927371134311914*a(n-42) +1930821571862111389228*a(n-45) -2969971596940665098694*a(n-48) -15691544597797458064414*a(n-51) +60195727469018420135322*a(n-54) -18425774814964242441790*a(n-57) -221007351593006545195382*a(n-60) +351200597093022652247912*a(n-63) -1699141009246819204192*a(n-66) -375553573660010348011562*a(n-69) +243573083285838143235369*a(n-72) +29890248258837795683634*a(n-75) -63879766913268664258948*a(n-78) +10566215714611654477810*a(n-81) +2627787588870559717725*a(n-84) -563760170081734493500*a(n-87) +21965898788460900000*a(n-90) for n>94

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A254425 A237231 A031627 * A237674 A183851 A238036

Adjacent sequences:  A252125 A252126 A252127 * A252129 A252130 A252131

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 20 13:32 EDT 2022. Contains 353873 sequences. (Running on oeis4.)