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A221519 as a simple table

n a(n)
1 0
2 6
3 10
4 36
5 94
6 274
7 768
8 2182
9 6170
10 17476
11 49470
12 140066
13 396544
14 1122694
15 3178538
16 8999012
17 25477790
18 72132146
19 204218880
20 578179846
21 1636929594
22 4634437764
23 13120914558
24 37147634242
25 105171535360
26 297759253766

[0,6,10,36,94,274,768,2182,6170,17476,49470,
 140066,396544,1122694,3178538,8999012,25477790,
 72132146,204218880,578179846,1636929594,
 4634437764,13120914558,37147634242,105171535360,
 297759253766]

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Last modified September 29 16:13 EDT 2020. Contains 337432 sequences. (Running on oeis4.)