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A004209
as a triangular array
10
10
11
10
11
100
10
11
12
101
10
11
12
20
110
10
11
12
13
21
111
10
11
12
13
20
22
1000
10
11
12
13
14
21
100
1001
10
11
12
13
14
20
22
101
1010
10
11
12
13
14
15
21
23
102
1011
10
11
12
13
14
15
20
22
30
A004209
as a square array
10
10
10
10
10
10
10
10
10
10
10
11
11
11
11
11
11
11
11
11
11
100
12
12
12
12
12
12
12
12
101
20
13
13
13
13
13
13
110
21
20
14
14
14
14
111
22
21
20
15
15
1000
100
22
21
20
1001
101
23
22
1010
102
30
1011
A004209
as an upper right triangle
10
10
10
10
10
10
10
10
10
10
10
11
11
11
11
11
11
11
11
11
11
100
12
12
12
12
12
12
12
12
101
20
13
13
13
13
13
13
110
21
20
14
14
14
14
111
22
21
20
15
15
1000
100
22
21
20
1001
101
23
22
1010
102
30
1011
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Last modified May 27 16:21 EDT 2024. Contains 372880 sequences. (Running on oeis4.)
