Many excellent designs for a new banner were submitted. We will use the best of them in rotation.
1,1
Table of n, a(n) for n=1..6.
Cf. 2 X n A000079, n X 1 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: A185665 A183883 A049081 * A055629 A131751 A042863
Adjacent sequences: A069429 A069430 A069431 * A069433 A069434 A069435
nonn
R. H. Hardin, Mar 22 2002.
approved