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A000150 as a simple table

n a(n)
0 0
1 0
2 1
3 2
4 7
5 20
6 66
7 212
8 715
9 2424
10 8398
11 29372
12 104006
13 371384
14 1337220
15 4847208
16 17678835
17 64821680
18 238819350
19 883629164
20 3282060210
21 12233125112
22 45741281820
23 171529777432
24 644952073662
25 2430973096720
26 9183676536076

[0,0,1,2,7,20,66,212,715,2424,8398,29372,104006,
 371384,1337220,4847208,17678835,64821680,
 238819350,883629164,3282060210,12233125112,
 45741281820,171529777432,644952073662,
 2430973096720,9183676536076]

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Last modified February 21 04:43 EST 2018. Contains 299389 sequences. (Running on oeis4.)