1,1
R. J. Penrose, Twistor Newsletter, No. 41, p. 22, 1996.
Z. Sunic, Tree morphisms, transducers and integer sequences
Sequence in context: A124283 A143645 A003176 this_sequence A003177 A038530 A108190
Adjacent sequences: A003135 A003136 A003137 this_sequence A003139 A003140 A003141
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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