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A289489 as a simple table

n a(n)
0 1
1 0
2 0
3 1
4 4
5 15
6 104
7 644
8 3696
9 23388
10 151842
11 979110
12 6445659
13 43148963
14 290832906
15 1977914328
16 13574296048
17 93787977144
18 651970844448
19 4558718881927
20 32038664402074
21 226200869873851
22 1603811085640698
23 11415385190127413
24 81538284501095235

[1,0,0,1,4,15,104,644,3696,23388,151842,979110,
 6445659,43148963,290832906,1977914328,13574296048,
 93787977144,651970844448,4558718881927,
 32038664402074,226200869873851,1603811085640698,
 11415385190127413,81538284501095235]

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Last modified August 29 13:45 EDT 2024. Contains 375517 sequences. (Running on oeis4.)