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 A190039 Number of nondecreasing arrangements of n+2 numbers in 0..7 with the last equal to 7 and each after the second equal to the sum of one or two of the preceding three. 1
 11, 17, 22, 31, 43, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 440, 460, 480, 500, 520, 540, 560, 580, 600, 620, 640, 660, 680, 700, 720, 740, 760, 780, 800, 820, 840, 860, 880, 900, 920, 940, 960, 980, 1000, 1020 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 7 of A190041. LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = 20*n - 60 for n>5. Conjectures from Colin Barker, May 04 2018: (Start) G.f.: x*(11 - 5*x - x^2 + 4*x^3 + 3*x^4 + 5*x^5 + 3*x^6) / (1 - x)^2. a(n) = 2*a(n-1) - a(n-2) for n>7. (End) EXAMPLE Some solutions for n=3:   3  1  1  6  7  2  1  1  2  0  2  1  1  2  5  3   4  6  3  7  7  3  3  3  5  7  5  6  2  7  7  4   7  7  4  7  7  5  4  4  7  7  5  6  3  7  7  4   7  7  5  7  7  7  4  7  7  7  7  7  4  7  7  7   7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7 CROSSREFS Cf. A190041. Sequence in context: A050715 A006618 A184551 * A066074 A106563 A106574 Adjacent sequences:  A190036 A190037 A190038 * A190040 A190041 A190042 KEYWORD nonn AUTHOR R. H. Hardin, May 04 2011 STATUS approved

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Last modified September 16 14:20 EDT 2021. Contains 347472 sequences. (Running on oeis4.)