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A004251 formatted as a simple table:

n a(n)
1 1
2 2
3 4
4 11
5 31
6 102
7 342
8 1213
9 4361
10 16016
11 59348
12 222117
13 836315
14 3166852
15 12042620
16 45967479
17 176005709
18 675759564
19 2600672458 

[1,2,4,11,31,102,342,1213,4361,16016,59348,222117,
 836315,3166852,12042620,45967479,176005709,
 675759564,2600672458]

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

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