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A138738 as a simple table

n a(n)
0 1
1 1
2 1
3 7
4 25
5 121
6 1561
7 9871
8 101137
9 1293265
10 15765841
11 226501111
12 3355388521
13 55348183177
14 981791212585
15 19611613003711
16 387083895223201
17 8241127257050401
18 193814428658623777
19 4572332597344204135
20 116627907470591924281
21 3142752742361513926681

[1,1,1,7,25,121,1561,9871,101137,1293265,15765841,
 226501111,3355388521,55348183177,981791212585,
 19611613003711,387083895223201,8241127257050401,
 193814428658623777,4572332597344204135,
 116627907470591924281,3142752742361513926681]

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)