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A054993 formatted as a simple table:

n a(n)
0 1
1 2
2 8
3 42
4 260
5 1796
6 13396
7 105706
8 870772
9 7420836
10 65004584
11 582521748
12 5320936416
13 49402687392
14 465189744448
15 4434492302426
16 42731740126228
17 415736458808868
18 4079436831493480
19 40338413922226212
20 401652846850965808
21 4024556509468827432
22 40558226664529024000

[1,2,8,42,260,1796,13396,105706,870772,7420836,
 65004584,582521748,5320936416,49402687392,
 465189744448,4434492302426,42731740126228,
 415736458808868,4079436831493480,
 40338413922226212,401652846850965808,
 4024556509468827432,40558226664529024000]

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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