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A002203 as a simple table

n a(n)
0 2
1 2
2 6
3 14
4 34
5 82
6 198
7 478
8 1154
9 2786
10 6726
11 16238
12 39202
13 94642
14 228486
15 551614
16 1331714
17 3215042
18 7761798
19 18738638
20 45239074
21 109216786
22 263672646
23 636562078
24 1536796802
25 3710155682
26 8957108166
27 21624372014
28 52205852194
29 126036076402
30 304278004998

[2,2,6,14,34,82,198,478,1154,2786,6726,16238,
 39202,94642,228486,551614,1331714,3215042,7761798,
 18738638,45239074,109216786,263672646,636562078,
 1536796802,3710155682,8957108166,21624372014,
 52205852194,126036076402,304278004998]

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Last modified November 19 06:03 EST 2019. Contains 329310 sequences. (Running on oeis4.)