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A219557 as a simple table

n a(n)
0 1
1 3
2 9
3 33
4 96
5 273
6 749
7 1953
8 4916
9 12023
10 28642
11 66575
12 151544
13 338294
14 741880
15 1601048
16 3403936
17 7137386
18 14774713
19 30219025
20 61115184
21 122300146
22 242312186
23 475589389
24 925158391
25 1784529840
26 3414565313
27 6483608230
28 12221370425
29 22876263089
30 42534593868

[1,3,9,33,96,273,749,1953,4916,12023,28642,66575,
 151544,338294,741880,1601048,3403936,7137386,
 14774713,30219025,61115184,122300146,242312186,
 475589389,925158391,1784529840,3414565313,
 6483608230,12221370425,22876263089,42534593868]

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Last modified January 18 05:37 EST 2022. Contains 350419 sequences. (Running on oeis4.)