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A164981 as a triangular array

1
21
531
121041
29301651
7087562361
169245185913171
4086765843341364081
9851836178411585461925091
2378492553123850205283426061101
574113079154971238673423366121234173111

A164981 as a square array

12512297016940898523785741
131030872456761836492513079
1416561855841784531215497
1523913341158385012386
163113654620527342
17401928343366
18502601212
1961341
11073
111
1
12512297016940898523785741
131030872456761836492513079
1416561855841784531215497
1523913341158385012386
163113654620527342
17401928343366
18502601212
1961341
11073
111
1