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A018027 as a simple table

n a(n)
0 1
1 2
2 6
3 18
4 47
5 123
6 324
7 849
8 2225
9 5832
10 15284
11 40055
12 104976
13 275114
14 721005
15 1889568
16 4952069
17 12978092
18 34012224
19 89137243
20 233605663
21 612220032
22 1604470380
23 4204901941
24 11019960576
25 28880466844
26 75688234942
27 198359290368
28 519848403193
29 1362388228962

[1,2,6,18,47,123,324,849,2225,5832,15284,40055,
 104976,275114,721005,1889568,4952069,12978092,
 34012224,89137243,233605663,612220032,1604470380,
 4204901941,11019960576,28880466844,75688234942,
 198359290368,519848403193,1362388228962]

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Last modified August 17 22:59 EDT 2019. Contains 326059 sequences. (Running on oeis4.)