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A109956 as a triangular array

1
-11
3-41
-1218-71
55-8842-101
-273455-24575-131
1428-24481428-510117-161
-775213566-83793325-910168-191
43263-7691249588-212526578-1472228-221
-246675444015-296010134550-4563011700-2223297-251

A109956 as a square array

1-13-1255-2731428-775243263-246675
1-418-88455-244813566-76912444015
1-742-2451428-837949588-296010
1-1075-5103325-21252134550
1-13117-9106578-45630
1-16168-147211700
1-19228-2223
1-22297
1-25
1
1-13-1255-2731428-775243263-246675
1-418-88455-244813566-76912444015
1-742-2451428-837949588-296010
1-1075-5103325-21252134550
1-13117-9106578-45630
1-16168-147211700
1-19228-2223
1-22297
1-25
1