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A000240 as a simple table

n a(n)
1 1
2 0
3 3
4 8
5 45
6 264
7 1855
8 14832
9 133497
10 1334960
11 14684571
12 176214840
13 2290792933
14 32071101048
15 481066515735
16 7697064251744
17 130850092279665
18 2355301661033952
19 44750731559645107
20 895014631192902120
21 18795307255050944541
22 413496759611120779880

[1,0,3,8,45,264,1855,14832,133497,1334960,
 14684571,176214840,2290792933,32071101048,
 481066515735,7697064251744,130850092279665,
 2355301661033952,44750731559645107,
 895014631192902120,18795307255050944541,
 413496759611120779880]

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Last modified May 30 08:43 EDT 2020. Contains 334712 sequences. (Running on oeis4.)