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A274289 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 9
5 22
6 54
7 134
8 335
9 843
10 2132
11 5409
12 13761
13 35088
14 89638
15 229361
16 587678
17 1507586
18 3871589
19 9952087
20 25604573
21 65927447
22 169875992
23 438016016
24 1130103976
25 2917412699
26 7535482753
27 19473430909
28 50347508572
29 130228143004
30 336985674038

[1,1,2,4,9,22,54,134,335,843,2132,5409,13761,
 35088,89638,229361,587678,1507586,3871589,9952087,
 25604573,65927447,169875992,438016016,1130103976,
 2917412699,7535482753,19473430909,50347508572,
 130228143004,336985674038]

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Last modified December 13 03:41 EST 2019. Contains 329968 sequences. (Running on oeis4.)