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Also positions of 1's in A108336, which gives the coefficients of b(n) such that (B(x))^2 has coefficients 1 or 2 mod 4.
Table of n, a(n) for n=0..57.
Sequence in context: A238961 A238974 A139013 * A064519 A048968 A185737
Adjacent sequences: A108334 A108335 A108336 * A108338 A108339 A108340
N. J. A. Sloane, Jul 02 2005
Additional comments from Nadia Heninger, Jul 14 2007