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A204001 as a triangular array

1
-11
-611
-917-11
-1239-3611
-1569-11965-11
-18107-272294-10611
-21153-515846-630161-11
-24207-8681925-22321218-23211
-27269-13513783-60175214

A204001 as a square array

1-1-6-9-12-15-18-21-24-27
11173969107153207269
1-1-36-119-272-515-868-1351
116529484619253783
1-1-106-630-2232-6017
1116112185214
1-1-232
11
1
1-1-6-9-12-15-18-21-24-27
11173969107153207269
1-1-36-119-272-515-868-1351
116529484619253783
1-1-106-630-2232-6017
1116112185214
1-1-232
11
1