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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 September 24 13:43 EDT 2021. Contains 347643 sequences. (Running on oeis4.)