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A303243 as a simple table

n a(n)
1 4
2 2
3 18
4 8
5 60
6 56
7 236
8 428
9 1248
10 3264
11 8624
12 24720
13 65816
14 187464
15 509576
16 1428608
17 3932112
18 10932480
19 30245800
20 83854984
21 232353544
22 643805072
23 1784418352
24 4944349600
25 13703715720
26 37974373160
27 105243781928
28 291657188656

[4,2,18,8,60,56,236,428,1248,3264,8624,24720,
 65816,187464,509576,1428608,3932112,10932480,
 30245800,83854984,232353544,643805072,1784418352,
 4944349600,13703715720,37974373160,105243781928,
 291657188656]

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Last modified October 21 03:38 EDT 2021. Contains 348141 sequences. (Running on oeis4.)