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A208521 as a triangular array

1
22
342
4684
5820164
6104040248
712708084488
8141121402241686416
91616822450444828812816
10182403361008100896057616032
11203304801848201626401920

A208521 as a square array

1234567891011
2468101214161820
28204070112168240330
4164080140224336480
4248422450410081848
84816844810082016
8642889602640
161285761920
16160
32
1234567891011
2468101214161820
28204070112168240330
4164080140224336480
4248422450410081848
84816844810082016
8642889602640
161285761920
16160
32