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A002605 as a simple table

n a(n)
0 0
1 1
2 2
3 6
4 16
5 44
6 120
7 328
8 896
9 2448
10 6688
11 18272
12 49920
13 136384
14 372608
15 1017984
16 2781184
17 7598336
18 20759040
19 56714752
20 154947584
21 423324672
22 1156544512
23 3159738368
24 8632565760
25 23584608256
26 64434348032
27 176037912576
28 480944521216
29 1313964867584

[0,1,2,6,16,44,120,328,896,2448,6688,18272,49920,
 136384,372608,1017984,2781184,7598336,20759040,
 56714752,154947584,423324672,1156544512,
 3159738368,8632565760,23584608256,64434348032,
 176037912576,480944521216,1313964867584]

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Last modified November 19 18:39 EST 2019. Contains 329323 sequences. (Running on oeis4.)