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A210521
as a triangular array
1
3
5
2
4
6
8
10
12
14
7
9
11
13
15
17
19
21
23
25
27
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
61
63
65
46
48
50
52
54
56
58
60
62
64
66
68
A210521
as a square array
1
3
2
8
7
17
16
30
29
47
46
68
5
4
10
9
19
18
32
31
49
48
6
12
11
21
20
34
33
51
50
14
13
23
22
36
35
53
52
15
25
24
38
37
55
54
27
26
40
39
57
56
28
42
41
59
58
44
43
61
60
45
63
62
65
64
66
A210521
as an upper right triangle
1
3
2
8
7
17
16
30
29
47
46
68
5
4
10
9
19
18
32
31
49
48
6
12
11
21
20
34
33
51
50
14
13
23
22
36
35
53
52
15
25
24
38
37
55
54
27
26
40
39
57
56
28
42
41
59
58
44
43
61
60
45
63
62
65
64
66
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Last modified May 13 15:16 EDT 2024. Contains 372520 sequences. (Running on oeis4.)
