A265439 - OEIS

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A265439 as a simple table

n	a(n)
1	1
2	1
3	145
4	57721
5	41855199
6	569620472894
7	7361174970568815
8	1484662166072017164173
9	589336120060277543986621142

[1,1,145,57721,41855199,569620472894, 7361174970568815,1484662166072017164173, 589336120060277543986621142]