1,1
See A118141 for definitions and references.
A subsequence of A117870.
Sequence in context: A134921 A117870 A031363 this_sequence A024821 A059610 A047610
Adjacent sequences: A118139 A118140 A118141 this_sequence A118143 A118144 A118145
nonn
D. E. Knuth, May 11 2006
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