1,1

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: A075959 A011564 A022530 this_sequence A069415 A069275 A115348

Adjacent sequences: A069386 A069387 A069388 this_sequence A069390 A069391 A069392

nonn

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