

A071603


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 +, , *, /.


0




OFFSET

1,2


LINKS

Table of n, a(n) for n=1..9.
Index entries for similar sequences


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)


CROSSREFS

Cf. A060315, A070960.
Sequence in context: A086616 A040027 A182968 * A090595 A027040 A111063
Adjacent sequences: A071600 A071601 A071602 * A071604 A071605 A071606


KEYWORD

more,nonn


AUTHOR

Koksal Karakus (karakusk(AT)hotmail.com), Jun 02 2002


STATUS

approved



