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A111955 as a simple table

n a(n)
0 0
1 1
2 4
3 7
4 20
5 45
6 112
7 267
8 648
9 1561
10 3772
11 9103
12 21980
13 53061
14 128104
15 309267
16 746640
17 1802545
18 4351732
19 10506007
20 25363748
21 61233501
22 147830752
23 356895003
24 861620760
25 2080136521
26 5021893804
27 12123924127
28 29269742060
29 70663408245

[0,1,4,7,20,45,112,267,648,1561,3772,9103,21980,
 53061,128104,309267,746640,1802545,4351732,
 10506007,25363748,61233501,147830752,356895003,
 861620760,2080136521,5021893804,12123924127,
 29269742060,70663408245]

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Last modified August 5 13:54 EDT 2021. Contains 346469 sequences. (Running on oeis4.)