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A306495 as a simple table

n a(n)
0 1
1 4
2 16
3 74
4 402
5 2542
6 18446
7 151482
8 1390738
9 14126582
10 157365222
11 1908110866
12 25022451482
13 352918443438
14 5327630246542
15 85716034274282
16 1464281837606946
17 26470821156031462
18 504879319309407158
19 10132393298394712002
20 213441590598213760042

[1,4,16,74,402,2542,18446,151482,1390738,14126582,
 157365222,1908110866,25022451482,352918443438,
 5327630246542,85716034274282,1464281837606946,
 26470821156031462,504879319309407158,
 10132393298394712002,213441590598213760042]

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Last modified January 31 01:17 EST 2023. Contains 359947 sequences. (Running on oeis4.)