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A221215
as a triangular array
1
6
5
2
3
4
15
14
13
12
7
8
9
10
11
28
27
26
25
24
23
16
17
18
19
20
21
22
45
44
43
42
41
40
39
38
29
30
31
32
33
34
35
36
37
66
65
64
63
62
61
60
59
58
57
46
47
48
49
50
51
52
53
54
55
56
91
A221215
as a square array
1
6
2
15
7
28
16
45
29
66
46
91
5
3
14
8
27
17
44
30
65
47
4
13
9
26
18
43
31
64
48
12
10
25
19
42
32
63
49
11
24
20
41
33
62
50
23
21
40
34
61
51
22
39
35
60
52
38
36
59
53
37
58
54
57
55
56
A221215
as an upper right triangle
1
6
2
15
7
28
16
45
29
66
46
91
5
3
14
8
27
17
44
30
65
47
4
13
9
26
18
43
31
64
48
12
10
25
19
42
32
63
49
11
24
20
41
33
62
50
23
21
40
34
61
51
22
39
35
60
52
38
36
59
53
37
58
54
57
55
56
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Last modified May 12 23:55 EDT 2024. Contains 372497 sequences. (Running on oeis4.)
