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Search: id:A003513
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| A003513 |
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Number of regular sequences of length n.
(Formerly M1685)
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+0
1
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OFFSET
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2,2
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REFERENCES
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P. C. Fishburn et al., Van Lier sequences, Discrete Appl. Math., 27 (1990), 209-220.
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MAPLE
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A003513 := proc() local a, b, n ; a := {[1, 1]} ; n := 3 ; while true do b := {} ; for s in a do subsa := combinat[choose](s) ; for i in subsa do newa := add(k, k=i) ; if newa >= op(-1, s) then b := b union {[op(s), newa]} ; fi ; od; od; print(n, nops(b) ) ; a := b ; n := n+1 ; od; end: A003513() ; R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 22 2007
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CROSSREFS
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Sequence in context: A005270 A080839 A011834 this_sequence A113731 A113676 A074925
Adjacent sequences: A003510 A003511 A003512 this_sequence A003514 A003515 A003516
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KEYWORD
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nonn,nice,more
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AUTHOR
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njas
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EXTENSIONS
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a(9) from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 22 2007
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