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A081551 as a triangular array

1
1011
100101102
1000100110021003
1000010001100021000310004
100000100001100002100003100004100005
1000000100000110000021000003100000410000051000006
1000000010000001100000021000000310000004100000051000000610000007

A081551 as a square array

110100100010000100000100000010000000
11101100110001100001100000110000001
102100210002100002100000210000002
100310003100003100000310000003
10004100004100000410000004
100005100000510000005
100000610000006
10000007
110100100010000100000100000010000000
11101100110001100001100000110000001
102100210002100002100000210000002
100310003100003100000310000003
10004100004100000410000004
100005100000510000005
100000610000006
10000007