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 A229718 Number of arrays of length 2 that are sums of n consecutive elements of length 2+n-1 permutations of 0..2+n-2, and no two consecutive rises or falls in the latter permutation. 0
 2, 4, 8, 18, 26, 40, 52, 70, 86, 108, 128, 154, 178, 208 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 2 of A229717. LINKS Table of n, a(n) for n=1..14. FORMULA Empirical: a(n) = 2*a(n-1) - 2*a(n-3) + a(n-4) for n > 5. EXAMPLE Some solutions for n=4: 10 6 9 7 9 8 8 8 6 8 7 6 7 10 10 7 7 9 8 8 6 10 7 6 8 9 10 7 9 8 9 6 CROSSREFS Sequence in context: A171719 A185178 A351471 * A246469 A092507 A347036 Adjacent sequences: A229715 A229716 A229717 * A229719 A229720 A229721 KEYWORD nonn,more AUTHOR R. H. Hardin, Sep 27 2013 STATUS approved

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Last modified September 21 02:47 EDT 2023. Contains 365486 sequences. (Running on oeis4.)