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A318806 as a triangular array

1
12
123
1234
12456
124678
124791011
124710121314
12481215171819
1248131720222324
124814202427293031
12481522283235373839
124815243238424547

A318806 as a square array

1111111111111
222222222222
33444444444
4567788888
679101213141515
810121517202224
11131720242832
141822273238
1923293542
24303745
313847
39
1111111111111
222222222222
33444444444
4567788888
679101213141515
810121517202224
11131720242832
141822273238
1923293542
24303745
313847
39