1,1
R. J. Penrose, Twistor Newsletter, No. 41, p. 22, 1996.
Sequence in context: A143645 A003176 A003138 this_sequence A038530 A108190 A070740
Adjacent sequences: A003174 A003175 A003176 this_sequence A003178 A003179 A003180
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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