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A212473 Number of 0..3 arrays of length 2*n+1 with sum no more than 3*n in any length 2n subsequence (=50% duty cycle) 1
30, 486, 7862, 126606, 2034200, 32644314, 523487828, 8390738062, 134446993320, 2153764911576, 34495886876214, 552428007496418, 8845775486728392, 141630619844515292, 2267494906950636872, 36300174404152871822 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A212471

LINKS

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

EXAMPLE

Some solutions for n=3

..0....2....2....2....0....1....0....1....0....0....2....2....1....3....0....0

..0....0....0....0....0....1....3....1....0....1....2....0....0....0....1....1

..2....3....2....1....2....0....0....0....1....1....3....0....1....0....1....3

..1....3....3....0....0....3....1....0....1....3....0....1....0....0....0....0

..2....0....1....3....1....2....2....1....1....0....0....1....1....1....0....3

..0....0....1....1....2....2....1....3....2....0....1....0....0....2....1....0

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

CROSSREFS

Sequence in context: A004416 A125487 A258417 * A127544 A133927 A082556

Adjacent sequences:  A212470 A212471 A212472 * A212474 A212475 A212476

KEYWORD

nonn

AUTHOR

R. H. Hardin May 17 2012

STATUS

approved

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Last modified May 25 05:44 EDT 2019. Contains 323539 sequences. (Running on oeis4.)