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A120897 as a simple table

n a(n)
0 1
1 3
2 10
3 33
4 106
5 336
6 1056
7 3296
8 10234
9 31648
10 97551
11 299888
12 919865
13 2816291
14 8608712
15 26278538
16 80120533
17 244022331
18 742525242
19 2257527861
20 6858558246
21 20822959508
22 63181453350
23 191601205342
24 580749971840
25 1759465640586

[1,3,10,33,106,336,1056,3296,10234,31648,97551,
 299888,919865,2816291,8608712,26278538,80120533,
 244022331,742525242,2257527861,6858558246,
 20822959508,63181453350,191601205342,580749971840,
 1759465640586]

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Last modified December 12 20:12 EST 2019. Contains 329961 sequences. (Running on oeis4.)