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Search: id:A058397
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| 1, 3, 6, 13, 22, 42, 66, 112, 172, 270, 397, 602, 858, 1245, 1748, 2464, 3381, 4671, 6302, 8537, 11372, 15147, 19914, 26201, 34057, 44250, 56986, 73277, 93497, 119161, 150809, 190590, 239496, 300388, 374912, 467135, 579394, 717384, 884813
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OFFSET
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1,2
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FORMULA
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a(n) = sum(A026820(n, k), k=1..n).
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PROGRAM
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(PARI) a(n)=if(n<1, 0, polcoeff(sum(k=1, n, 1/prod(i=1, k, (1-x^i)), x*O(x^n)), n))
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CROSSREFS
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A026820.
Sequence in context: A034734 A019079 A048134 this_sequence A022811 A002799 A058554
Adjacent sequences: A058394 A058395 A058396 this_sequence A058398 A058399 A058400
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KEYWORD
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nonn
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Dec 11 2000
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EXTENSIONS
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More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 21 2003
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