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A198714 Number of nX7 0..3 arrays with values 0..3 introduced in row major order and no element equal to any horizontal or vertical neighbor 2
122, 58825, 28609241, 13925032958, 6778819400772, 3300094936852775, 1606578861528554441, 782129027546108478208, 380763168247444298026697, 185366606445710896112671190, 90241867886483759053800200221 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A198715

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..126

FORMULA

Empirical: a(n) = 820*a(n-1) -205689*a(n-2) +23977335*a(n-3) -1448890080*a(n-4) +40681354716*a(n-5) +113470351405*a(n-6) -45083135350759*a(n-7) +1384281526165416*a(n-8) -16268081626571563*a(n-9) -63890727017432669*a(n-10) +4141584863538946248*a(n-11) -41819886892303325457*a(n-12) -30483804619910407683*a(n-13) +3863177257558021068078*a(n-14) -27574675558592643871665*a(n-15) -5974253069771812381395*a(n-16) +994204560645628682891988*a(n-17) -4133294712546191129276631*a(n-18) -5200219344858789634094007*a(n-19) +79782056692975632581941806*a(n-20) -145976694071885459756226729*a(n-21) -381423099164490179830401489*a(n-22) +1687752294947845021038392100*a(n-23) -947863788801858331624770840*a(n-24) -4416578720165084280803867511*a(n-25) +7519754083669273956859949007*a(n-26) -393515001351016977961508328*a(n-27) -8318760918675594342013626309*a(n-28) +7729370069736269915861360652*a(n-29) -2679235928159828068047490236*a(n-30) +224133015493782945421410924*a(n-31) +60130490872795258151715444*a(n-32) -9198797534128825159826898*a(n-33)

EXAMPLE

Some solutions with all values from 0 to 3 for n=4

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

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

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

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

CROSSREFS

Sequence in context: A209105 A223131 A208256 * A199653 A241112 A240705

Adjacent sequences:  A198711 A198712 A198713 * A198715 A198716 A198717

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 29 2011

STATUS

approved

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Last modified December 4 15:36 EST 2021. Contains 349526 sequences. (Running on oeis4.)