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A231308 as a simple table

n a(n)
0 0
1 1
2 512
3 19684
4 262656
5 1972809
6 10340352
7 42326416
8 144558080
9 429746905
10 1144558080
11 2787694596
12 6304338432
13 13392193969
14 26965385216
15 51835553344
16 95684861952
17 170423429841
18 294044152320
19 493111127620
20 806044152320
21 1287391174201
22 2013313370112

[0,1,512,19684,262656,1972809,10340352,42326416,
 144558080,429746905,1144558080,2787694596,
 6304338432,13392193969,26965385216,51835553344,
 95684861952,170423429841,294044152320,
 493111127620,806044152320,1287391174201,
 2013313370112]

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Last modified November 16 17:02 EST 2019. Contains 329201 sequences. (Running on oeis4.)