A297685 Number of 5Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1s.
32, 291, 3744, 34872, 401678, 4202440, 45865837, 488402012, 5277134441, 56590184544, 609118876500, 6543424122789, 70369098323857, 756319883731372, 8131309593772974, 87407051279518533, 939657110269352989
Offset: 1
Keywords
Examples
Some solutions for n=4 ..0..1..1..1. .0..1..0..0. .1..0..0..0. .1..0..0..1. .1..0..0..0 ..0..1..0..1. .0..0..0..0. .1..0..0..0. .0..1..0..0. .0..1..0..1 ..0..1..0..0. .0..0..1..0. .0..0..0..0. .0..0..0..0. .0..1..0..1 ..1..0..0..1. .0..0..0..0. .1..0..0..0. .0..1..0..0. .0..1..0..1 ..1..0..0..0. .1..0..1..1. .0..1..0..1. .0..0..0..0. .0..1..1..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A297682.
Formula
Empirical: a(n) = 4*a(n-1) +45*a(n-2) +198*a(n-3) +1120*a(n-4) -571*a(n-5) +949*a(n-6) -25951*a(n-7) +43907*a(n-8) -121981*a(n-9) +237707*a(n-10) -305033*a(n-11) +951497*a(n-12) -2179565*a(n-13) +1393985*a(n-14) +38155*a(n-15) +856624*a(n-16) +1417955*a(n-17) -2925138*a(n-18) +4386425*a(n-19) -3349236*a(n-20) +7904975*a(n-21) -936917*a(n-22) +6331851*a(n-23) -431305*a(n-24) -2123285*a(n-25) -1887476*a(n-26) -6000225*a(n-27) -5171754*a(n-28) -5025966*a(n-29) -3580724*a(n-30) +728778*a(n-31) +1200558*a(n-32) +668712*a(n-33) +511075*a(n-34) +1377776*a(n-35) +458144*a(n-36) +151448*a(n-37) -54584*a(n-38) -42912*a(n-39) -30464*a(n-40) +3840*a(n-41)
Comments