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A006645 as a simple table

n a(n)
0 0
1 0
2 1
3 4
4 14
5 44
6 131
7 376
8 1052
9 2888
10 7813
11 20892
12 55338
13 145428
14 379655
15 985520
16 2545720
17 6547792
18 16777993
19 42847988
20 109099078
21 277040572
22 701794187
23 1773851304
24 4474555476
25 11266301976
26 28318897549
27 71070913036
28 178106093666
29 445740656420
30 1114147888655

[0,0,1,4,14,44,131,376,1052,2888,7813,20892,55338,
 145428,379655,985520,2545720,6547792,16777993,
 42847988,109099078,277040572,701794187,1773851304,
 4474555476,11266301976,28318897549,71070913036,
 178106093666,445740656420,1114147888655]

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Last modified April 23 12:44 EDT 2024. Contains 371913 sequences. (Running on oeis4.)