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A000900 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 2
5 10
6 28
7 106
8 344
9 1272
10 4592
11 17692
12 69384
13 283560
14 1191984
15 5171512
16 23087168
17 105883456
18 498572416
19 2404766224
20 11878871456
21 59975885856
22 309439708352
23 1628919330208
24 8746079933568
25 47840206525056

[0,0,0,1,2,10,28,106,344,1272,4592,17692,69384,
 283560,1191984,5171512,23087168,105883456,
 498572416,2404766224,11878871456,59975885856,
 309439708352,1628919330208,8746079933568,
 47840206525056]

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Last modified February 19 18:22 EST 2019. Contains 320327 sequences. (Running on oeis4.)