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: A124415 A031947 A049357 this_sequence A139005 A093221 A023321

Adjacent sequences: A069399 A069400 A069401 this_sequence A069403 A069404 A069405

nonn

Ron Hardin (rhhardin(AT)att.net), Mar 22 2002.