A250969 Number of (n+1)X(4+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements.
604, 12281, 249921, 5089900, 103684186, 2112130109, 43025963570, 876479703950, 17854730951799, 363717955042320, 7409282841342444, 150934183848595064, 3074673806193093731, 62634048639412217021, 1275915526747412367745
Offset: 1
Keywords
Examples
Some solutions for n=2 ..1..0..1..1..0....0..1..1..0..1....1..0..1..0..0....0..1..1..0..1 ..1..1..0..1..0....1..1..1..0..1....1..0..1..0..0....1..0..1..1..0 ..0..1..0..1..1....0..0..0..1..1....0..1..0..0..0....0..1..0..0..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Formula
Empirical: a(n) = 32*a(n-1) -322*a(n-2) +2227*a(n-3) -12086*a(n-4) +47762*a(n-5) -142463*a(n-6) +321616*a(n-7) -516143*a(n-8) +570208*a(n-9) -437734*a(n-10) +223620*a(n-11) -61118*a(n-12) +2048*a(n-13) -581*a(n-14) +2307*a(n-15) -712*a(n-16) +60*a(n-17)
Comments