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A180821 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 11
6 409
7 6946
8 108997
9 1113650
10 9684748
11 64448228
12 375427744
13 1820591506
14 7980182839
15 30660616489
16 109065451832
17 351179673979
18 1065973101574
19 2992063116800
20 8019394451018
21 20182278132284
22 48949438473158

[0,0,0,1,11,409,6946,108997,1113650,9684748,
 64448228,375427744,1820591506,7980182839,
 30660616489,109065451832,351179673979,
 1065973101574,2992063116800,8019394451018,
 20182278132284,48949438473158]

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Last modified September 6 17:28 EDT 2024. Contains 375717 sequences. (Running on oeis4.)