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A218685 as a simple table

n a(n)
0 1
1 0
2 1
3 6
4 34
5 270
6 3415
7 31230
8 681026
9 6949920
10 230637870
11 2546120514
12 119281951006
13 1394371349490
14 87612425583018
15 1069010047029672
16 86763885548985810
17 1094149501538197236
18 111443560982774811439
19 1442387644419293694144
20 180179254059921915232864

[1,0,1,6,34,270,3415,31230,681026,6949920,
 230637870,2546120514,119281951006,1394371349490,
 87612425583018,1069010047029672,86763885548985810,
 1094149501538197236,111443560982774811439,
 1442387644419293694144,180179254059921915232864]

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Last modified May 9 07:04 EDT 2024. Contains 372346 sequences. (Running on oeis4.)