2,1

Cf. 2 X n A000225, 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: A110852 A136677 A135812 this_sequence A132591 A116232 A094496

Adjacent sequences: A069449 A069450 A069451 this_sequence A069453 A069454 A069455

nonn

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