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A002999 as a simple table

n a(n)
0 1
1 2
2 6
3 18
4 56
5 170
6 492
7 1358
8 3600
9 9234
10 23060
11 56342
12 135192
13 319514
14 745500
15 1720350
16 3932192
17 8912930
18 20054052
19 44826662
20 99614760
21 220201002
22 484442156
23 1061158958
24 2315255856
25 5033164850
26 10905190452
27 23555211318
28 50734301240
29 108984795194

[1,2,6,18,56,170,492,1358,3600,9234,23060,56342,
 135192,319514,745500,1720350,3932192,8912930,
 20054052,44826662,99614760,220201002,484442156,
 1061158958,2315255856,5033164850,10905190452,
 23555211318,50734301240,108984795194]

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Last modified November 23 14:53 EST 2014. Contains 249851 sequences.