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A223567 Number of nX6 0..1 arrays with antidiagonals unimodal 1
64, 4096, 153664, 4174016, 97140736, 2137096192, 47016116224, 1034354556928, 22755800252416, 500627605553152, 11013807322169344, 242303761087725568, 5330682743929962496, 117275020366459174912, 2580050448062101848064 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A223569
LINKS
FORMULA
a(n) = product{ (1+(i*(i+1)/2))^2 , i=1..(min(n,6)-1) } * (1+(min(n,6)*(min(n,6)+1)/2))^(max(n,6)-min(n,6)+1)
a(n) = 22*a(n-1) for n>5
EXAMPLE
Some solutions for n=4
..0..0..1..1..0..1....0..0..0..0..0..0....0..0..0..0..0..1....0..0..0..0..1..0
..0..0..1..0..1..0....0..0..0..1..0..0....0..0..0..1..1..0....0..0..1..1..1..0
..0..1..0..1..1..1....0..0..1..1..0..0....0..1..0..1..0..0....0..0..0..1..0..1
..0..1..1..0..0..1....0..1..1..1..0..1....0..0..1..0..0..1....0..0..1..0..1..1
CROSSREFS
Sequence in context: A223802 A297379 A283862 * A223580 A267971 A229102
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 22 2013
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)