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A180970 as a simple table

n a(n)
0 1
1 3
2 13
3 22
4 44
5 90
6 196
7 406
8 852
9 1778
10 3740
11 7822
12 16404
13 34346
14 72004
15 150822
16 316076
17 662186
18 1387596
19 2907262
20 6091780
21 12763778
22 26744268
23 56036566
24 117413804
25 246015450
26 515476036
27 1080072022
28 2263070868
29 4741795442

[1,3,13,22,44,90,196,406,852,1778,3740,7822,16404,
 34346,72004,150822,316076,662186,1387596,2907262,
 6091780,12763778,26744268,56036566,117413804,
 246015450,515476036,1080072022,2263070868,
 4741795442]

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Last modified April 8 01:57 EDT 2020. Contains 333312 sequences. (Running on oeis4.)