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A000664 as a simple table

n a(n)
0 1
1 1
2 2
3 5
4 11
5 26
6 68
7 177
8 497
9 1476
10 4613
11 15216
12 52944
13 193367
14 740226
15 2960520
16 12334829
17 53394755
18 239544624
19 1111261697
20 5320103252
21 26237509076
22 133087001869
23 693339241737
24 3705135967663
25 20286965943329
26 113694201046379
27 651571521170323
28 3815204365835840
29 22806847476040913
30 139088381010541237
31 864777487052916454

[1,1,2,5,11,26,68,177,497,1476,4613,15216,52944,
 193367,740226,2960520,12334829,53394755,239544624,
 1111261697,5320103252,26237509076,133087001869,
 693339241737,3705135967663,20286965943329,
 113694201046379,651571521170323,3815204365835840,
 22806847476040913,139088381010541237,
 864777487052916454]

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Last modified May 26 16:00 EDT 2018. Contains 304608 sequences. (Running on oeis4.)