login

A074712 as a triangular array

1
22
323
4444
54345
666666
7674767
88688688
989858989
10101010101010101010
11109811611891011
121212121212121212121212

A074712 as a square array

123456789101112
22446688101012
343676910912
44648810812
56785101112
666810612
789101112
8810812
910912
101012
1112
12
123456789101112
22446688101012
343676910912
44648810812
56785101112
666810612
789101112
8810812
910912
101012
1112
12