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A000081 as a simple table

n a(n)
0 0
1 1
2 1
3 2
4 4
5 9
6 20
7 48
8 115
9 286
10 719
11 1842
12 4766
13 12486
14 32973
15 87811
16 235381
17 634847
18 1721159
19 4688676
20 12826228
21 35221832
22 97055181
23 268282855
24 743724984
25 2067174645
26 5759636510
27 16083734329
28 45007066269
29 126186554308
30 354426847597

[0,1,1,2,4,9,20,48,115,286,719,1842,4766,12486,
 32973,87811,235381,634847,1721159,4688676,
 12826228,35221832,97055181,268282855,743724984,
 2067174645,5759636510,16083734329,45007066269,
 126186554308,354426847597]

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Last modified December 13 09:05 EST 2017. Contains 295957 sequences.