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A011970 as a simple table

n a(n)
0 1
1 4
2 8
3 15
4 37
5 114
6 409
7 1657
8 7432
9 36401
10 192713
11 1094076
12 6618379
13 42436913
14 287151994
15 2042803419
16 15229360185
17 118645071202
18 963494800557
19 8138047375093
20 71351480138824
21 648222594284197
22 6092330403828749

[1,4,8,15,37,114,409,1657,7432,36401,192713,
 1094076,6618379,42436913,287151994,2042803419,
 15229360185,118645071202,963494800557,
 8138047375093,71351480138824,648222594284197,
 6092330403828749]

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Last modified February 20 20:30 EST 2020. Contains 332084 sequences. (Running on oeis4.)