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Search: id:A102147
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| 1, 1, 5, 35, 315, 3465, 45045, 675675, 11486475, 218243025, 4583103525, 105411381075, 2635284526875, 71152682225625, 2063427784543125, 63966261320836875, 2110886623587616875, 73881031825566590625
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OFFSET
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1,3
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REFERENCES
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R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 256.
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FORMULA
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a(n) = Sum[E(n, k)A000027[k], k=0...n], where E(n, k) is a second-order Eulerian number [A008517].
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CROSSREFS
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Cf. A001147, A008517.
Apparently equals A051577(n-2), n>1.
Sequence in context: A015683 A000357 A051577 this_sequence A124564 A113342 A125864
Adjacent sequences: A102144 A102145 A102146 this_sequence A102148 A102149 A102150
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KEYWORD
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nonn
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AUTHOR
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Ross La Haye (rlahaye(AT)new.rr.com), Feb 14 2005
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