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A000228 as a simple table

n a(n)
1 1
2 1
3 3
4 7
5 22
6 82
7 333
8 1448
9 6572
10 30490
11 143552
12 683101
13 3274826
14 15796897
15 76581875
16 372868101
17 1822236628
18 8934910362
19 43939164263
20 216651036012
21 1070793308942

[1,1,3,7,22,82,333,1448,6572,30490,143552,683101,
 3274826,15796897,76581875,372868101,1822236628,
 8934910362,43939164263,216651036012,1070793308942]

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Last modified February 21 02:19 EST 2018. Contains 299388 sequences. (Running on oeis4.)