A177302 - OEIS

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A177302 as a simple table

n	a(n)
0	1
1	1
2	252
3	756756
4	457507512
5	184619047020
6	97087382008034
7	49254897805981056
8	22802419346927105088

[1,1,252,756756,457507512,184619047020, 97087382008034,49254897805981056, 22802419346927105088]