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A036220 as a simple table

n a(n)
0 1
1 21
2 252
3 2268
4 17010
5 112266
6 673596
7 3752892
8 19702683
9 98513415
10 472864392
11 2192371272
12 9865670724
13 43257171636
14 185387878440
15 778629089448
16 3211844993973
17 13036312034361
18 52145248137444
19 205836505805700
20 802762372642230
21 3096369151620030

[1,21,252,2268,17010,112266,673596,3752892,
 19702683,98513415,472864392,2192371272,9865670724,
 43257171636,185387878440,778629089448,
 3211844993973,13036312034361,52145248137444,
 205836505805700,802762372642230,3096369151620030]

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Last modified April 19 16:21 EDT 2024. Contains 371794 sequences. (Running on oeis4.)