

A118544


Number of subsets A of {1,2,...,n} with A+A = AA.


6



2, 4, 8, 14, 24, 40, 66, 106, 174, 286, 480, 814, 1412, 2480, 4476, 8184, 15230, 28652, 54488, 104262, 201266, 390090, 760234, 1486030, 2914492, 5728506, 11289420, 22279222, 44046072, 87181188, 172777354, 342724456, 680524908, 1352154964, 2688763324
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OFFSET

1,1


COMMENTS

Keywords: sumdominant sets, MSTD sets.
Some authors work with subsets of [0..n1], others with subsets of [1..n].


LINKS

James Wilcox and Giovanni Resta, Table of n, a(n) for n = 1..40 (first 35 terms from James Wilcox)


EXAMPLE

a(4)=14: two of the sixteen subsets of {1,2,3,4} have A+A<AA (specifically, {1,3,4} and {1,2,4}).


CROSSREFS

Cf. A222807, A222808, A140794.
Sequence in context: A123655 A084683 A271493 * A222037 A019274 A164173
Adjacent sequences: A118541 A118542 A118543 * A118545 A118546 A118547


KEYWORD

nonn


AUTHOR

Kevin O'Bryant, May 07 2006


EXTENSIONS

a(21)a(29) from Robert Gerbicz, Nov 19 2010
a(30)a(35) from James Wilcox, Jul 22 2013


STATUS

approved



