2,1

Cf. 2 X n A000079, n X 1 A000225, vertical path of 1 A069361-A069395, vertical paths of 0+1 A069396-A069416, vertical path of 1 not 0 A069417-A069428, no vertical paths A069429-A069447, no horizontal or vertical paths A069448-A069452.

Adjacent sequences: A069442 A069443 A069444 this_sequence A069446 A069447 A069448

Sequence in context: A016830 A103346 A123394 this_sequence A013832 A034989 A016878

nonn

Ron Hardin (rhh(AT)cadence.com), Mar 22 2002.