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A217528 as a simple table

n a(n)
1 1
2 2
3 6
4 22
5 78
6 254
7 766
8 2174
9 5886
10 15358
11 38910
12 96254
13 233470
14 557054
15 1310718
16 3047422
17 7012350
18 15990782
19 36175870
20 81264638
21 181403646
22 402653182
23 889192446
24 1954545662
25 4278190078
26 9328132094
27 20266876926
28 43889197054
29 94757715966
30 204010946558

[1,2,6,22,78,254,766,2174,5886,15358,38910,96254,
 233470,557054,1310718,3047422,7012350,15990782,
 36175870,81264638,181403646,402653182,889192446,
 1954545662,4278190078,9328132094,20266876926,
 43889197054,94757715966,204010946558]

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Last modified July 15 12:46 EDT 2020. Contains 335771 sequences. (Running on oeis4.)