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A037648 as a simple table

n a(n)
1 3
2 18
3 109
4 657
5 3942
6 23653
7 141921
8 851526
9 5109157
10 30654945
11 183929670
12 1103578021
13 6621468129
14 39728808774
15 238372852645
16 1430237115873
17 8581422695238
18 51488536171429
19 308931217028577
20 1853587302171462

[3,18,109,657,3942,23653,141921,851526,5109157,
 30654945,183929670,1103578021,6621468129,
 39728808774,238372852645,1430237115873,
 8581422695238,51488536171429,308931217028577,
 1853587302171462]

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Last modified January 28 12:37 EST 2022. Contains 350656 sequences. (Running on oeis4.)