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Search: id:A069138
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| A069138 |
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Triangle formed by multiplying Stirling numbers of 2nd kind S2(n,m) (A008277) by m+1. |
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+0
1
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| 2, 2, 3, 2, 9, 4, 2, 21, 24, 5, 2, 45, 100, 50, 6, 2, 93, 360, 325, 90, 7, 2, 189, 1204, 1750, 840, 147, 8, 2, 381, 3864, 8505, 6300, 1862, 224, 9, 2, 765, 12100, 38850, 41706, 18522, 3696, 324, 10, 2, 1533, 37320, 170525, 255150, 159789, 47040, 6750, 450, 11
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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The number of rhyme schemes for a stanza of n+1 lines with m rhyming syllables in its first n lines.
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REFERENCES
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Suggested by R. K. Guy, Mar 11, 2002.
Stephen Pollard, C.S. Peirce and the Bell Numbers, Mathematics Magazine, Vol. 76 (2003), pp. 99-106.
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FORMULA
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T(n, m) = (m+1)*S2(n, m).
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EXAMPLE
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2; 2,3; 2,9,4; 2,21,24,5; 2,45,100,50,6; ...
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CROSSREFS
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Row sums give Bell numbers A000110.
Sequence in context: A015999 A016001 A016012 this_sequence A058671 A016002 A098189
Adjacent sequences: A069135 A069136 A069137 this_sequence A069139 A069140 A069141
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Apr 10 2002
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Jul 01 2002
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