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A181854 as a triangular array

1
12
146
171824
111427688
11697286468528
122163556105013321392
1293171697494286821071611136
13749332091150224770361084101641856

A181854 as a square array

111111111
2471116222937
6184297163317493
247628655616973209
884681050494211502
5281332868224770
13921071636108
1113641016
41856
111111111
2471116222937
6184297163317493
247628655616973209
884681050494211502
5281332868224770
13921071636108
1113641016
41856