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A168445
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Number of compositions a(1),...,a(k) of n, for some k, such that a(i+1) <= a(i) + 1 for 1 <= i < k and a(1) <= a(k) + 1.
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1
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1, 2, 4, 6, 11, 18, 31, 52, 91, 155, 268, 464, 802, 1390, 2411, 4178, 7249, 12578, 21823, 37870, 65724, 114061, 197960, 343578, 596317, 1034983, 1796359, 3117837, 5411478, 9392460, 16302081, 28294850, 49110242, 85238716, 147945552, 256783448, 445689300
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OFFSET
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1,2
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LINKS
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Alois P. Heinz, Table of n, a(n) for n = 1..400
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MAPLE
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b:= proc(n, r, f) option remember; `if` (n=0, `if` (f-1<=r, 1, 0), add (b(n-i, i, f), i=1..min (r+1, n))) end: a:= n-> add (b(n-i, i, i), i=1..n): seq (a(n), n=1..40); # Alois P. Heinz, Dec 15 2009
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CROSSREFS
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Cf. A003116.
Sequence in context: A026658 A138688 A131298 * A185192 A007053 A005684
Adjacent sequences: A168442 A168443 A168444 * A168446 A168447 A168448
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KEYWORD
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nonn,changed
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AUTHOR
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Vladeta Jovovic, Nov 25 2009
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EXTENSIONS
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More terms from Alois P. Heinz, Dec 15 2009
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STATUS
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approved
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