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A291716 as a triangular array

1
40
908
1602444
25072176610
360144660299612092
49028817881149264648323940
640480411635676269924181169610866196

A291716 as a square array

1491625364964
0000000
82472144288480
4417666017884116
61029961149235676
1209264648269924
3239401811696
10866196
1491625364964
0000000
82472144288480
4417666017884116
61029961149235676
1209264648269924
3239401811696
10866196