1,2

Cf. 1 X n A000225, 2 X n A005061, n X 2 A001333, 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: A031726 A101249 A031612 this_sequence A097770 A031522 A035754

Adjacent sequences: A069362 A069363 A069364 this_sequence A069366 A069367 A069368

nonn

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