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A035604 as a simple table

n a(n)
0 0
1 2
2 40
3 402
4 2720
5 14002
6 58728
7 209762
8 658048
9 1854882
10 4780008
11 11414898
12 25534368
13 53972178
14 108568488
15 209070018
16 387328512
17 693230658
18 1202893992
19 2029779538
20 3339504032
21 5369283570
22 8453107432
23 13053926690
24 19804348032
25 29557550050
26 43450388072

[0,2,40,402,2720,14002,58728,209762,658048,
 1854882,4780008,11414898,25534368,53972178,
 108568488,209070018,387328512,693230658,
 1202893992,2029779538,3339504032,5369283570,
 8453107432,13053926690,19804348032,29557550050,
 43450388072]

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Last modified May 26 22:57 EDT 2019. Contains 323597 sequences. (Running on oeis4.)