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A010900 as a simple table

n a(n)
0 4
1 13
2 42
3 136
4 440
5 1424
6 4609
7 14918
8 48285
9 156284
10 505844
11 1637264
12 5299328
13 17152321
14 55516872
15 179691313
16 581606398
17 1882483892
18 6093030640
19 19721296176
20 63831867233
21 206604436042
22 668716032329
23 2164431415224
24 7005609443657
25 22675037578854

[4,13,42,136,440,1424,4609,14918,48285,156284,
 505844,1637264,5299328,17152321,55516872,
 179691313,581606398,1882483892,6093030640,
 19721296176,63831867233,206604436042,668716032329,
 2164431415224,7005609443657,22675037578854]

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Last modified May 28 09:52 EDT 2020. Contains 334679 sequences. (Running on oeis4.)