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A361681 as a triangular array

1
21
521
10821
1740821
2616144821
3750626344821
501312146626844821
6529486812172626844821
8259452604811062173226844821
10111026841496454811617173226844821

A361681 as a square array

12510172637506582101
1284016150613122948594511026
12844263146668122604884149
1284426817261106264548
12844268173211617
128442681732
12844268
12844
128
12
1
12510172637506582101
1284016150613122948594511026
12844263146668122604884149
1284426817261106264548
12844268173211617
128442681732
12844268
12844
128
12
1