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A038078 formatted as a simple table:

n a(n)
0 1
1 2
2 1
3 2
4 6
5 20
6 69
7 270
8 1026
9 4120
10 16794
11 70230
12 298306
13 1288912
14 5642559
15 25007756
16 111998920
17 506348902
18 2308338456
19 10602357346
20 49026021552
21 228085486580
22 1067020210339
23 5016982766202
24 23698640081356

[1,2,1,2,6,20,69,270,1026,4120,16794,70230,298306,
 1288912,5642559,25007756,111998920,506348902,
 2308338456,10602357346,49026021552,228085486580,
 1067020210339,5016982766202,23698640081356]

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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