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A194588 as a simple table

n a(n)
0 1
1 0
2 2
3 2
4 8
5 17
6 49
7 128
8 356
9 983
10 2759
11 7779
12 22087
13 63000
14 180478
15 518846
16 1496236
17 4326383
18 12539335
19 36419069
20 105971473
21 308866226
22 901573732
23 2635235789
24 7712078755
25 22594899002
26 66266698424
27 194531585078
28 571561286576
29 1680679630089
30 4945738222801

[1,0,2,2,8,17,49,128,356,983,2759,7779,22087,
 63000,180478,518846,1496236,4326383,12539335,
 36419069,105971473,308866226,901573732,2635235789,
 7712078755,22594899002,66266698424,194531585078,
 571561286576,1680679630089,4945738222801]

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