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.

Sequence in context: A013759 A016832 A103350 this_sequence A016880 A016940 A017012

Adjacent sequences: A069444 A069445 A069446 this_sequence A069448 A069449 A069450

nonn

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