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A221640
as a triangular array
1
1
2
1
2
3
1
3
4
7
1
3
5
9
11
1
4
7
12
18
23
1
4
8
15
23
30
34
1
5
10
20
27
37
43
52
1
5
12
22
32
42
50
58
68
1
6
14
27
36
47
57
68
76
87
1
6
16
30
42
54
64
75
85
96
105
A221640
as a square array
1
1
1
1
1
1
1
1
1
1
1
2
2
3
3
4
4
5
5
6
6
3
4
5
7
8
10
12
14
16
7
9
12
15
20
22
27
30
11
18
23
27
32
36
42
23
30
37
42
47
54
34
43
50
57
64
52
58
68
75
68
76
85
87
96
105
A221640
as an upper right triangle
1
1
1
1
1
1
1
1
1
1
1
2
2
3
3
4
4
5
5
6
6
3
4
5
7
8
10
12
14
16
7
9
12
15
20
22
27
30
11
18
23
27
32
36
42
23
30
37
42
47
54
34
43
50
57
64
52
58
68
75
68
76
85
87
96
105
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Last modified June 7 14:59 EDT 2024. Contains 373202 sequences. (Running on oeis4.)
