A298891 Number of nX4 0..1 arrays with every element equal to 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
0, 2, 4, 11, 31, 80, 229, 681, 1969, 5973, 18031, 54874, 167752, 513625, 1575095, 4835994, 14859480, 45674676, 140452387, 431987865, 1328865560, 4088283165, 12578581331, 38703117525, 119090222855, 366452309799, 1127630050984
Offset: 1
Keywords
Examples
Some solutions for n=7 ..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..1..1 ..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..1..1..0. .0..1..0..1 ..0..0..0..0. .0..0..0..0. .0..0..0..0. .1..0..0..1. .1..0..0..1 ..1..1..1..1. .1..1..1..1. .0..0..0..0. .1..1..1..1. .1..1..1..1 ..1..0..0..1. .1..1..1..1. .0..0..0..0. .0..0..0..0. .0..0..0..0 ..0..1..1..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0 ..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Crossrefs
Cf. A298895.
Formula
Empirical: a(n) = 6*a(n-1) -9*a(n-2) +5*a(n-3) -32*a(n-4) +38*a(n-5) +25*a(n-6) +98*a(n-7) -119*a(n-8) +40*a(n-9) -550*a(n-10) +580*a(n-11) -916*a(n-12) +830*a(n-13) +263*a(n-14) +83*a(n-15) +2328*a(n-16) -229*a(n-17) +503*a(n-18) -4047*a(n-19) -417*a(n-20) -3044*a(n-21) +2435*a(n-22) -11065*a(n-23) +3356*a(n-24) -5303*a(n-25) +1559*a(n-26) +14545*a(n-27) +32995*a(n-28) +22512*a(n-29) -15204*a(n-30) -12820*a(n-31) -31577*a(n-32) -21644*a(n-33) +3315*a(n-34) +18307*a(n-35) -24537*a(n-36) -14373*a(n-37) +11731*a(n-38) +26599*a(n-39) +15792*a(n-40) -11544*a(n-41) -3386*a(n-42) -4977*a(n-43) +5179*a(n-44) -2851*a(n-45) +4056*a(n-46) -977*a(n-47) +3855*a(n-48) -121*a(n-49) +305*a(n-50) -1567*a(n-51) -458*a(n-52) -273*a(n-53) +321*a(n-54) -8*a(n-55) +78*a(n-56) -20*a(n-57) -6*a(n-58) for n>59
Comments