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Search: id:A121870
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| A121870 |
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Monthly Problem 10791, second expression. |
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+0
2
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| 1, 1, 2, 9, 61, 554, 6565, 96677, 1716730, 36072181, 881242577, 24674241834, 783024550969, 27896201305769, 1106485798248706, 48517267642373105, 2337333266369553253, 123040664089658462650, 7043260281573138384701, 436533086101058798529933
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OFFSET
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0,3
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REFERENCES
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A. Fekete and others, Problem 10791, Amer. Math. Monthly, 108 (No. 2, 2001), 177-178.
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FORMULA
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Equals A121867(n)^2 + A121868(n)^2.
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MAPLE
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#To generate a(n), enter a number for n. A121870a:= proc(a) local i, t: i:=1: t:=0: for i to 100 do t:=t+evalf((i^(a-1))*(I)^i/(i)!): od:RETURN(round(abs(t^2))): end: a:= A121870a(n); - Russell Walsmith (ixitol(AT)gmail.com), Apr 18 2008
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CROSSREFS
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Cf. A121869, A024429, A024430, A121867, A121868.
Sequence in context: A107883 A088182 A006155 this_sequence A113662 A052820 A100262
Adjacent sequences: A121867 A121868 A121869 this_sequence A121871 A121872 A121873
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KEYWORD
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nonn
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AUTHOR
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njas, Sep 05 2006
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