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A071603
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Number of different positive integers that we can obtain by using the integers {1,2,...,n} using each number at most once and the operators +, -, *, /.
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0
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OFFSET
| 1,2
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LINKS
| Index entries for similar sequences
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EXAMPLE
| a(4)=31 because we can obtain the positive integers 1,2,...,28 and 30,32,36 by using the integers {1, 2, 3, 4} at most once and the four operations. For example 30 = 3*2*(4+1)
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CROSSREFS
| Cf. A060315, A070960.
Sequence in context: A086616 A040027 A182968 * A090595 A027040 A111063
Adjacent sequences: A071600 A071601 A071602 * A071604 A071605 A071606
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KEYWORD
| more,nonn
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AUTHOR
| Koksal Karakus (karakusk(AT)hotmail.com), Jun 02 2002
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