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A178964 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 4
6 14
7 34
8 69
9 496
10 2896
11 11056
12 33661
13 349504
14 2856944
15 14873104
16 60376809
17 819786496
18 8615785216
19 56814228736
20 288294050521
21 4835447317504
22 62112775514624
23 495812444583424
24 3019098162602349
25 60283564499562496
26 915153344223809536
27 8575634961418940416
28 60921822444067346581
29 1411083019275488149504
30 24716980773496372066304

[1,1,1,1,1,4,14,34,69,496,2896,11056,33661,349504,
 2856944,14873104,60376809,819786496,8615785216,
 56814228736,288294050521,4835447317504,
 62112775514624,495812444583424,3019098162602349,
 60283564499562496,915153344223809536,
 8575634961418940416,60921822444067346581,
 1411083019275488149504,24716980773496372066304]

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Last modified April 24 22:03 EDT 2019. Contains 322446 sequences. (Running on oeis4.)