a(n) = 2^n - 2*n*A000048(n). 1, 0, 0, 2, 0, 2, 4, 2, 0, 8, 4, 2, 16, 2, 4, 38, 0, 2, 64, 2, 16, 134, 4, 2, 256, 32, 4, 512
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