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Search: id:A092271
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| A092271 |
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First in a series of triangular arrays counting permutations of partitions. |
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+0
2
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| 1, 1, 1, 2, 3, 1, 6, 8, 6, 1, 24, 30, 20, 10, 1, 120, 144, 90, 40, 15, 1, 720, 840, 504, 210, 70, 21, 1
(list; table; graph; listen)
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OFFSET
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1,4
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COMMENT
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Generate signatures in accordance with A086141. Map to partitions in accordance with A025487 Calculate number of permutations in accordance with Abramowitz and Stegun, p. 831 (reference M2). Display the results as illustrated by A090774. The second array is
3
20 15
90 120 45
504 630 420 105
...
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REFERENCES
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Abramowitz and Stegun, p. 831.
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LINKS
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M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
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EXAMPLE
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The array begins
1
1 1
2 3 1
6 8 6 1
24 30 20 10 1
...
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CROSSREFS
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Cf. A086141, A025487, A090774, A007290.
Sequence in context: A035485 A074306 A036039 this_sequence A054115 A100822 A086211
Adjacent sequences: A092268 A092269 A092270 this_sequence A092272 A092273 A092274
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KEYWORD
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nonn,tabl
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AUTHOR
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Alford Arnold (Alford1940(AT)aol.com), Feb 14 2004
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