1,2
1 (1); 12 (9); 123 (66); 1234 (466); 12345 (3267); 123456 (22875); ...
Cf. A055143-A055150.
Sequence in context: A003408 A037698 A037607 this_sequence A014830 A048439 A134432
Adjacent sequences: A055145 A055146 A055147 this_sequence A055149 A055150 A055151
nonn,base
Patrick De Geest (pdg(AT)worldofnumbers.com), Apr 15 2000.
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