OFFSET
1,2
COMMENTS
a(2*n+1) = A144926(2*n+1), n>0. a(2*p) = 2^p + binomial(2*p,p) if p is an odd prime, cf. A144926. - Vladeta Jovovic, Oct 02 2008
LINKS
W. F. Lunnon, Table of n, a(n) for n = 1..39
W. F. Lunnon, C program for A144926 and A086328
FORMULA
a(n) = 2^n - A086323(n).
For a prime p, a(p) = 2 and the two circulants are those with all rows equal (0, 0, 0, ..., 0) or all rows equal (1, 1, 1, ..., 1).
CROSSREFS
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 30 2003
EXTENSIONS
More terms from Fred Lunnon, Oct 28 2008
a(0) removed, a(1) corrected by Max Alekseyev, Sep 25 2009
STATUS
approved