2,2
Cf. 1 X n A000225, 2 X n A016269, 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: A097317 A052461 A173375 * A189910 A189904 A189160
Adjacent sequences: A069395 A069396 A069397 * A069399 A069400 A069401
nonn
R. H. Hardin (rhhardin(AT)att.net), Mar 22 2002.