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A111954 as a simple table

n a(n)
0 1
1 0
2 3
3 4
4 13
5 28
6 71
7 168
8 409
9 984
10 2379
11 5740
12 13861
13 33460
14 80783
15 195024
16 470833
17 1136688
18 2744211
19 6625108
20 15994429
21 38613964
22 93222359
23 225058680
24 543339721
25 1311738120
26 3166815963
27 7645370044
28 18457556053
29 44560482148
30 107578520351

[1,0,3,4,13,28,71,168,409,984,2379,5740,13861,
 33460,80783,195024,470833,1136688,2744211,6625108,
 15994429,38613964,93222359,225058680,543339721,
 1311738120,3166815963,7645370044,18457556053,
 44560482148,107578520351]

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)