A203982 Number of (n+1)X7 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order

6144, 186624, 5668704, 178855776, 5671161216, 180709558848, 5764846339584, 184042295652096, 5876808948959616, 187680079115373888, 5993929440264576384, 191431738781962474176, 6113912564634046252416, 195265725121889159876928

Offset

1,1

Comments

Column 6 of A203984

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 39*a(n-1) +117*a(n-2) -13419*a(n-3) +42120*a(n-4) +1465776*a(n-5) -7558272*a(n-6) -59591376*a(n-7) +389959596*a(n-8) +776691180*a(n-9) -7353962460*a(n-10) -230291100*a(n-11) +53356676400*a(n-12) -41452398000*a(n-13) -124357194000*a(n-14) +143489070000*a(n-15)

Example

Some solutions for n=4
..0..1..2..2..1..2..2....0..0..1..0..1..2..1....0..1..2..2..1..2..0
..2..1..0..0..0..0..0....2..2..2..2..1..2..0....2..1..0..0..0..2..1
..2..1..2..1..1..1..1....1..1..1..0..0..2..0....2..1..2..2..1..2..0
..0..1..2..0..0..0..0....2..2..2..2..1..2..1....2..1..0..0..1..2..1
..2..1..2..1..1..1..1....0..0..1..0..1..2..0....0..1..2..2..1..0..0

Crossrefs

Sequence in context: A205833 A152388 A251787 * A204626 A318251 A281265

Adjacent sequences: A203979 A203980 A203981 * A203983 A203984 A203985

Keyword

nonn

Author

R. H. Hardin Jan 09 2012

Status

approved