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A137972 formatted as a simple table:

n a(n)
0 1
1 1
2 6
3 39
4 320
5 2787
6 25788
7 247731
8 2449188
9 24753960
10 254610962
11 2656496133
12 28046838948
13 299085697722
14 3216723340218
15 34852657892685
16 380063012970680
17 4168108473073596
18 45941874232280862
19 508664757809869052

[1,1,6,39,320,2787,25788,247731,2449188,24753960,
 254610962,2656496133,28046838948,299085697722,
 3216723340218,34852657892685,380063012970680,
 4168108473073596,45941874232280862,
 508664757809869052]

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Last modified December 6 13:15 EST 2009. Contains 170429 sequences.


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