A269095 Number of nX6 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three exactly once.
1620, 889056, 300056400, 86415197088, 22984646281176, 5826856525990272, 1430390977786967280, 343122372255163660560, 80890546793429923552008, 18813147168685841982033408, 4328190538478506032118840320
Offset: 1
Keywords
Examples
Some solutions for n=1 ..2..0..2..1..0..2. .1..3..1..2..3..1. .0..1..0..0..3..1. .0..3..3..1..1..0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A269097.
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
Comments