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A003500 as a simple table

n a(n)
0 2
1 4
2 14
3 52
4 194
5 724
6 2702
7 10084
8 37634
9 140452
10 524174
11 1956244
12 7300802
13 27246964
14 101687054
15 379501252
16 1416317954
17 5285770564
18 19726764302
19 73621286644
20 274758382274
21 1025412242452
22 3826890587534
23 14282150107684

[2,4,14,52,194,724,2702,10084,37634,140452,524174,
 1956244,7300802,27246964,101687054,379501252,
 1416317954,5285770564,19726764302,73621286644,
 274758382274,1025412242452,3826890587534,
 14282150107684]

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Last modified November 18 21:51 EST 2017. Contains 294912 sequences.