

A079302


Number of minimal nonBrauer chains for n.


4



0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 0, 3, 0, 0, 0, 1, 2, 0, 0, 18, 0, 13, 0, 0, 0, 0, 0, 6, 5, 2, 0, 3, 6, 0, 0, 0, 0, 37, 0, 1, 2, 0, 3, 34, 0, 17, 0, 25
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OFFSET

1,19


COMMENTS

In a general addition chain, each element > 1 is a sum of two previous elements. In a Brauer chain, each element > 1 is a sum of the immediately previous element and another previous element.


LINKS

D. W. Wilson, Table of n, a(n) for n = 1..1024
Eric Weisstein's World of Mathematics, Brauer Chain.


EXAMPLE

13 has a(13) = 1 minimal nonBrauer chain: (1,2,4,5,8,13).


CROSSREFS

Sequence in context: A080300 A116864 A255308 * A138806 A181105 A142971
Adjacent sequences: A079299 A079300 A079301 * A079303 A079304 A079305


KEYWORD

nonn


AUTHOR

David W. Wilson, Feb 09 2003


STATUS

approved



