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A233595 Number of (n+2)X(1+2) 0..2 arrays with no increasing sequence of length 3 horizontally, vertically or antidiagonally downwards 1
15272, 342185, 7610545, 169129037, 3756984641, 83451469774, 1853608731449, 41171843204299, 914496266769293, 20312503043503618, 451174881822359137, 10021353348112998329, 222591120354824691196, 4944123321916955713069 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A233602

LINKS

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

FORMULA

Empirical: a(n) = 25*a(n-1) +2*a(n-2) -1549*a(n-3) +1359*a(n-4) +35322*a(n-5) -27013*a(n-6) -345233*a(n-7) +159641*a(n-8) +1285880*a(n-9) -375833*a(n-10) -2431870*a(n-11) +439479*a(n-12) +2628508*a(n-13) -276145*a(n-14) -1679602*a(n-15) +92032*a(n-16) +613439*a(n-17) -14601*a(n-18) -111609*a(n-19) +738*a(n-20) +6490*a(n-21) +22*a(n-22) -121*a(n-23)

EXAMPLE

Some solutions for n=1

..1..0..1....1..2..0....0..0..2....1..0..2....0..1..0....0..2..1....0..2..0

..2..2..1....2..0..1....2..2..0....2..0..1....0..2..0....0..0..2....0..1..1

..2..2..2....1..0..0....2..0..2....2..2..2....2..1..1....2..0..1....1..2..0

CROSSREFS

Sequence in context: A252318 A233602 A233603 * A233594 A064982 A204317

Adjacent sequences:  A233592 A233593 A233594 * A233596 A233597 A233598

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2013

STATUS

approved

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Last modified January 20 23:20 EST 2019. Contains 319343 sequences. (Running on oeis4.)