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A005755 formatted as a simple table:

n a(n)
1 0
2 0
3 0
4 1
5 4
6 16
7 64
8 252
9 1018
10 4182
11 17510
12 74510
13 322034
14 1410362
15 6251114
16 27998532
17 126583634
18 577079333
19 2650573354
20 12256481666
21 57021299394
22 266754944481
23 1254245360430
24 5924659521632
25 28105641930102

[0,0,0,1,4,16,64,252,1018,4182,17510,74510,322034,
 1410362,6251114,27998532,126583634,577079333,
 2650573354,12256481666,57021299394,266754944481,
 1254245360430,5924659521632,28105641930102]

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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