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A001656 as a simple table

n a(n)
0 1
1 5
2 40
3 260
4 1820
5 12376
6 85085
7 582505
8 3994320
9 27372840
10 187628376
11 1285992240
12 8814405145
13 60414613805
14 414088493560
15 2838203264876
16 19453338487220
17 133335155341960
18 913892777190965
19 6263914210945105

[1,5,40,260,1820,12376,85085,582505,3994320,
 27372840,187628376,1285992240,8814405145,
 60414613805,414088493560,2838203264876,
 19453338487220,133335155341960,913892777190965,
 6263914210945105]

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Last modified February 18 03:44 EST 2020. Contains 332006 sequences. (Running on oeis4.)