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A340583 as a triangular array

1
03
104
1307
23406
2647012
4687608
412814612015
712161412128013
82116281224815018
122428282424161513012
14363249244816301318028

A340583 as a square array

10112244781214
3033661212212436
40448816162832
70771414282849
606612122424
1201212242448
80881616
150151530
1301313
18018
120
28
10112244781214
3033661212212436
40448816162832
70771414282849
606612122424
1201212242448
80881616
150151530
1301313
18018
120
28