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A147675-A147678 are from a quiz that someone asked me to help them with.
Table of n, a(n) for n=1..39.
From R. J. Mathar, Apr 22 2009: (Start)
a(n) = 2*a(n-2) = 5*A135530(n-1).
G.f.: -5*x*(2+x)/(-1+2*x^2). (End)
Sequence in context: A280154 A040093 A046797 * A070291 A183132 A141321
Adjacent sequences: A147672 A147673 A147674 * A147676 A147677 A147678
N. J. A. Sloane, Apr 21 2009
More terms from R. J. Mathar, Apr 22 2009