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See A212074 for a detailed description.
Table of n, a(n) for n=1..20.
Sequence in context: A023941 A065320 A164565 * A257421 A257428 A254237
Adjacent sequences: A212072 A212073 A212074 * A212076 A212077 A212078
N. J. A. Sloane, Apr 30 2012