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 A215224 Number of length-n 0..4 arrays connected end-around, with no sequence of L
 5, 20, 60, 240, 720, 2940, 10080, 38640, 140400, 529440, 1956900, 7335840, 27285180, 101960040, 380209980, 1419732000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A215228. LINKS EXAMPLE Some solutions for n=8: ..2....2....1....4....4....3....3....1....0....0....1....1....4....4....4....4 ..3....4....4....0....0....1....4....3....4....1....4....3....0....2....2....1 ..2....0....3....2....4....2....2....4....1....0....3....0....3....3....1....3 ..0....4....1....3....3....0....1....3....3....3....1....4....2....2....4....0 ..1....3....2....4....0....1....3....0....2....2....3....3....1....1....0....3 ..2....0....3....3....1....3....2....2....4....0....0....0....4....0....2....1 ..4....2....0....1....0....0....0....4....3....1....3....2....3....2....0....0 ..0....1....3....2....2....2....1....2....2....3....2....4....2....0....3....2 CROSSREFS Sequence in context: A319869 A038165 A327383 * A270939 A270631 A032340 Adjacent sequences:  A215221 A215222 A215223 * A215225 A215226 A215227 KEYWORD nonn,more AUTHOR R. H. Hardin, Aug 06 2012 STATUS approved

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Last modified September 27 15:21 EDT 2020. Contains 337383 sequences. (Running on oeis4.)