A259644 - OEIS

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A259644 as a simple table

n	a(n)
0	1
1	2
2	5
3	31
4	2419
5	176795035
6	883922739668546300971
7	1511516294872733607299090320742127160367108420362968907

[1,2,5,31,2419,176795035,883922739668546300971, 15115162948727336072990903207421271603671084203629\ 68907]