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Table of n, a(n) for n=1..19.
a[ 2n-1 ] = 2 a[ 2n-2 ] + 2 a[ n ] for n >= 3; a[ 2n ] = 2 a[ 2n-1 ] -a[ n ] - a[ n+1 ] for n >= 3
Sequence in context: A221181 A116503 A105204 * A103196 A113954 A191393
Adjacent sequences: A045689 A045690 A045691 * A045693 A045694 A045695