A217640 Number of nX3 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random 0..2 nX3 array.
9, 27, 163, 877, 5119, 29101, 166193, 949883, 5424617, 30992313, 177045523, 1011403721, 5777856321, 33007064639, 188559321601, 1077181452713, 6153607089559, 35153670287907, 200822133317793, 1147235248764407
Offset: 1
Keywords
Examples
Some solutions for n=3 ..0..0..2....0..0..0....1..0..0....0..0..1....0..0..0....0..0..2....0..0..0 ..0..1..2....0..0..0....1..0..0....0..1..2....0..0..0....0..1..1....0..0..0 ..1..2..2....1..2..2....0..0..0....2..2..2....0..1..2....1..1..1....2..0..0
Links
- R. H. Hardin, Table of n, a(n) for n = 1..71
Formula
Empirical: a(n) = 5*a(n-1) +3*a(n-2) +9*a(n-3) -10*a(n-4) -7*a(n-5) -166*a(n-6) -3*a(n-7) -122*a(n-8) -71*a(n-9) +165*a(n-10) +43*a(n-11) -43*a(n-12) -7*a(n-13) +3*a(n-14) for n>15
Comments