

A288728


Number of sumfree sets that can be created by adding n to all sumfree sets [1..n1].


0



1, 1, 3, 3, 7, 8, 18, 19, 47, 43, 102, 116, 238, 240, 553, 554, 1185, 1259, 2578, 2607, 5873, 5526, 11834, 12601, 24692, 24390, 53735, 52534, 107445, 107330, 218727, 215607, 461367, 427778, 891039, 910294, 1804606, 1706828, 3695418, 3411513, 7136850, 6892950
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OFFSET

1,3


COMMENTS

Using the standard definition of sumfree set, this is simply the difference of successive terms in A007865.


LINKS

Table of n, a(n) for n=1..42.
Eric Weisstein's World of Mathematics, SumFree Set


FORMULA

a(n) = A007865(n)  A007865(n1).


EXAMPLE

1 can be added to {};
2 can be added to {} but not {1};
3 can be added to {},{1},{2};
4 can be added to {},{1},{3} but not {2},{1,3},{2,3}.


CROSSREFS

Cf. A007865.
Sequence in context: A286110 A116157 A056357 * A213942 A144554 A177936
Adjacent sequences: A288725 A288726 A288727 * A288729 A288730 A288731


KEYWORD

nonn


AUTHOR

Ben Burns, Jun 14 2017


STATUS

approved



