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A131655
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Maximal number of different numbers that can be formed from n numbers using addition, subtraction, multiplication and division, when each number is used no more than once in a given expression.
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1
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OFFSET
| 1,2
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COMMENTS
| See triangle A133568: Each row gives the least sequence of n positive integers such that a(n) distinct numbers are generated by these operations. - Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 16 2007
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EXAMPLE
| a(2)=8 : from two variables x and y we obtain the eight functions x, y, x+y, x*y, x-y, y-x, x/y and y/x
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CROSSREFS
| Cf. A133568.
Sequence in context: A072352 A099100 A184756 * A105718 A045732 A077192
Adjacent sequences: A131652 A131653 A131654 * A131656 A131657 A131658
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KEYWORD
| nonn
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AUTHOR
| Daniel Rainjonneau (d.rainjonneau(AT)wanadoo.fr), Sep 11 2007
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EXTENSIONS
| Definition corrected by Rick L. Shepherd (rshepherd2(AT)hotmail.com), Sep 16 2007
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