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A006212 as a simple table

n a(n)
0 0
1 1
2 4
3 14
4 56
5 256
6 1324
7 7664
8 49136
9 345856
10 2652244
11 22014464
12 196658216
13 1881389056
14 19192151164
15 207961585664
16 2385488163296
17 28879019769856
18 367966308562084
19 4922409168011264
20 68978503204900376
21 1010472388453728256
22 15445185289163949004

[0,1,4,14,56,256,1324,7664,49136,345856,2652244,
 22014464,196658216,1881389056,19192151164,
 207961585664,2385488163296,28879019769856,
 367966308562084,4922409168011264,
 68978503204900376,1010472388453728256,
 15445185289163949004]

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Last modified February 19 07:51 EST 2019. Contains 320309 sequences. (Running on oeis4.)