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A072221 as a simple table

n a(n)
0 1
1 4
2 25
3 148
4 865
5 5044
6 29401
7 171364
8 998785
9 5821348
10 33929305
11 197754484
12 1152597601
13 6717831124
14 39154389145
15 228208503748
16 1330096633345
17 7752371296324
18 45184131144601
19 263352415571284
20 1534930362283105
21 8946229758127348
22 52142448186480985

[1,4,25,148,865,5044,29401,171364,998785,5821348,
 33929305,197754484,1152597601,6717831124,
 39154389145,228208503748,1330096633345,
 7752371296324,45184131144601,263352415571284,
 1534930362283105,8946229758127348,
 52142448186480985]

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)