A269107 Number of nX6 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three no more than once.

2592, 1090740, 342055548, 95166487524, 24808345933548, 6206909793496236, 1509593256271433868, 359627971978314972756, 84330282164848323860700, 19529981463869576058830652, 4477577440675705031339912748

Offset

1,1

Comments

Column 6 of A269109.

Links

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

Formula

Empirical: a(n) = 624*a(n-1) -148392*a(n-2) +17707654*a(n-3) -1237692774*a(n-4) +55270649556*a(n-5) -1656470723141*a(n-6) +34132157660412*a(n-7) -484096890617541*a(n-8) +4569992373952272*a(n-9) -25146261177957786*a(n-10) +25694778316842858*a(n-11) +756190434082200840*a(n-12) -6052462771631752224*a(n-13) +18126128855859433455*a(n-14) +18664609483184919500*a(n-15) -342070453287924453888*a(n-16) +1141375792492508055684*a(n-17) -1231488788816842507708*a(n-18) -2418565901590843869576*a(n-19) +9095171580512370570684*a(n-20) -8677540039273932904920*a(n-21) -4965678440542161492372*a(n-22) +17155105764294227912496*a(n-23) -13588702943203699236720*a(n-24) +4184136771765648014016*a(n-25) -441364595341874186304*a(n-26) for n>27

Example

Some solutions for n=1
..1..0..0..1..3..1. .3..1..3..1..0..1. .1..0..0..1..3..3. .0..0..1..3..2..2

Crossrefs

Cf. A269109.

Sequence in context: A033695 A269141 A269199 * A035773 A107569 A269287

Adjacent sequences: A269104 A269105 A269106 * A269108 A269109 A269110

Keyword

nonn

Author

R. H. Hardin, Feb 19 2016

Status

approved