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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 1
6144, 186624, 5668704, 178855776, 5671161216, 180709558848, 5764846339584, 184042295652096, 5876808948959616, 187680079115373888, 5993929440264576384, 191431738781962474176, 6113912564634046252416, 195265725121889159876928 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 27 12:08 EDT 2021. Contains 348276 sequences. (Running on oeis4.)