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A091615 as a triangular array

1
21
601
11601
2612401
612610401
13270268401
29017462248401
63840415660228401
139094638514658228401
3012219292136214456228401
649650082177876350142

A091615 as a square array

126112661132290638139030126496
10612267017440494621925008
1041026621563859212177
10482460146362876
10482258144350
10482256142
104822
1048
104
10
1
126112661132290638139030126496
10612267017440494621925008
1041026621563859212177
10482460146362876
10482258144350
10482256142
104822
1048
104
10
1