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: A023337 A115932 A137839 this_sequence A035896 A035777 A108001

Adjacent sequences: A069398 A069399 A069400 this_sequence A069402 A069403 A069404

nonn

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