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A253794 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal median nondecreasing horizontally and vertically 2
512, 2908, 14096, 66144, 299472, 1303600, 5525648, 23034276, 94841688, 386810592, 1566259600, 6306887152, 25284981392, 101016575076, 402445751816, 1599719168672, 6347297006736, 25147307796592, 99511016673904 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A253801

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -19*a(n-2) +13*a(n-3) -8*a(n-4) +27*a(n-5) -79*a(n-6) +156*a(n-7) -217*a(n-8) -235*a(n-9) +964*a(n-10) -1201*a(n-11) +1488*a(n-12) -256*a(n-13) -1064*a(n-14) +994*a(n-15) -1048*a(n-16) +254*a(n-17) -132*a(n-18) +400*a(n-19) -204*a(n-20) -56*a(n-21) +256*a(n-22) -40*a(n-23) +16*a(n-24) -16*a(n-26)

EXAMPLE

Some solutions for n=4

..0..0..0....0..1..1....1..1..1....1..0..0....1..1..0....1..1..0....1..1..0

..1..0..0....1..0..0....0..0..1....1..0..0....1..0..0....1..0..0....0..1..1

..1..1..1....0..1..1....1..0..1....1..0..0....0..0..0....1..0..0....1..1..0

..0..0..0....0..0..0....1..0..1....1..0..1....1..1..0....1..0..1....1..1..1

..0..1..0....0..1..1....1..0..0....1..1..0....0..1..1....0..1..1....1..1..0

..0..1..0....1..0..1....1..0..1....1..1..0....1..0..0....0..1..0....0..1..1

CROSSREFS

Sequence in context: A254354 A254189 A253801 * A253961 A253764 A253757

Adjacent sequences:  A253791 A253792 A253793 * A253795 A253796 A253797

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 13 2015

STATUS

approved

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Last modified September 19 12:17 EDT 2020. Contains 337178 sequences. (Running on oeis4.)