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A181847 as a triangular array

1
21
321
4431
54641
69111051
7615201561
8122436352171
912305670562881
10174288127126843691

A181847 as a square array

12345678910
124496121217
1361115243042
141020365688
15153570127
162156126
172884
1836
19
1
12345678910
124496121217
1361115243042
141020365688
15153570127
162156126
172884
1836
19
1