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A304915 as a simple table

n a(n)
0 1
1 2
2 2
3 172
4 342
5 26556
6 67220
7 4875160
8 14125030
9 973837420
10 3087573628
11 204536051176
12 692771715836
13 44412235657176
14 158358513025896
15 9874709152875568
16 36706645561910150
17 2234840966950941260
18 8601116786415880940
19 512801585354912006600
20 2032977466125710169236

[1,2,2,172,342,26556,67220,4875160,14125030,
 973837420,3087573628,204536051176,692771715836,
 44412235657176,158358513025896,9874709152875568,
 36706645561910150,2234840966950941260,
 8601116786415880940,512801585354912006600,
 2032977466125710169236]

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Last modified January 27 21:48 EST 2020. Contains 331297 sequences. (Running on oeis4.)