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A166890 as a triangular array

1
21
941
783061
10383646381
189686233986108101
443595139008206852072165121
126819603833052545736514943750234141
4292441971261051681736533615699201077606148315161
16801151910

A166890 as a square array

129781038189684435951268196042924419716801151910
143036462331390083833052126105168
16639862068554573617365336
181082072514941569920
1101653750107760
1122346148
114315
116
1
129781038189684435951268196042924419716801151910
143036462331390083833052126105168
16639862068554573617365336
181082072514941569920
1101653750107760
1122346148
114315
116
1