login

A135387 as a triangular array

2
12
012
0012
00012
000012
0000012
00000012
000000012

A135387 as a square array

210000000
21000000
2100000
210000
21000
2100
210
21
2
210000000
21000000
2100000
210000
21000
2100
210
21
2