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A198715 as a triangular array

1
11
242
525255
1417240117214
41120165486548120141
12284041070422500311070428404122
36558825174996595482959548295174996558825365
109441177228609241364637102851787199364637102

A198715 as a square array

112514411223651094
14251721201840458825411772
2254016548107042174996528609241
517265482500319548295364637102
1412011070429548295851787199
4184041749965364637102
12258825
365
112514411223651094
14251721201840458825411772
2254016548107042174996528609241
517265482500319548295364637102
1412011070429548295851787199
4184041749965364637102
12258825
365