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Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A331138
as
a triangular array
4
7
5
12
7
6
18
10
8
7
26
14
11
9
8
35
19
14
11
10
9
45
A331138
as
a square array
4
7
12
18
26
35
45
5
7
10
14
19
6
8
11
14
7
9
11
8
10
9
A331138
as
an upper right triangle
4
7
12
18
26
35
45
5
7
10
14
19
6
8
11
14
7
9
11
8
10
9