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A253866 Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal minimum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
20480, 288000, 3939840, 50414592, 659280384, 8536982016, 111370158592, 1445588517376, 18809857917440, 244401967088128, 3178205753000448, 41308041898770944, 537040145411359232, 6980815424323469824 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A253871

LINKS

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

FORMULA

Empirical: a(n) = 17*a(n-1) -16*a(n-2) -608*a(n-3) +3168*a(n-4) -23040*a(n-5) +62464*a(n-6) +148480*a(n-7) -477184*a(n-8) +1499136*a(n-9) -3899392*a(n-10) -8454144*a(n-11) +21626880*a(n-12) -2097152*a(n-13) -8388608*a(n-14) +25165824*a(n-15) -41943040*a(n-16) +16777216*a(n-17) for n>18

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Sequence in context: A242619 A224619 A186060 * A253873 A253539 A178585

Adjacent sequences:  A253863 A253864 A253865 * A253867 A253868 A253869

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 17 2015

STATUS

approved

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Last modified May 21 21:43 EDT 2022. Contains 353929 sequences. (Running on oeis4.)