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A201730 as a triangular array

1
20
510
14600
4126100
12210010000
365363631000
10941274322140000
32814372146211610000
98421476061567441800000

A201730 as a square array

1251441122365109432819842
016261003631274437214760
001106332214626156
000114116744
0000118
00000
0000
000
00
0
1251441122365109432819842
016261003631274437214760
001106332214626156
000114116744
0000118
00000
0000
000
00
0