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A030980 formatted as a simple table:

n a(n)
1 1
2 0
3 3
4 4
5 23
6 66
7 280
8 1030
9 4207
10 16852
11 69747
12 289950
13 1222540
14 5192344
15 22239672
16 95864902
17 415730735
18 1812177000
19 7936353049
20 34901789568
21 154067755503
22 682428824890
23 3032173906692
24 13510960371744

[1,0,3,4,23,66,280,1030,4207,16852,69747,289950,
 1222540,5192344,22239672,95864902,415730735,
 1812177000,7936353049,34901789568,154067755503,
 682428824890,3032173906692,13510960371744]

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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