2,1
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Problem E2429, Amer. Math. Monthly, 81 (1974), 1112-1113.
Index entries for sequences related to binary matrices
Sequence in context: A070754 A049887 A048216 this_sequence A133370 A144104 A088175
Adjacent sequences: A003506 A003507 A003508 this_sequence A003510 A003511 A003512
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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