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A117376 formatted as a simple table:

n a(n)
0 1
1 3
2 13
3 55
4 240
5 1057
6 4688
7 20879
8 93250
9 417272
10 1869725
11 8386137
12 37640961
13 169042436
14 759470361
15 3413223919
16 15343588991
17 68988110756
18 310233741889
19 1395268187372
20 6275807975664
21 28230370862051
22 126996552221811

[1,3,13,55,240,1057,4688,20879,93250,417272,
 1869725,8386137,37640961,169042436,759470361,
 3413223919,15343588991,68988110756,310233741889,
 1395268187372,6275807975664,28230370862051,
 126996552221811]

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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