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A053486 formatted as a simple table:

n a(n)
0 1
1 4
2 17
3 78
4 393
5 2208
6 13977
7 100026
8 806769
9 7280604
10 72865089
11 801693126
12 9620848953
13 125072630712
14 1751021612937
15 26265338542962
16 420245459734113
17 7144172944620084
18 128595113390582001
19 2443307155583319486
20 48866143115153174121

[1,4,17,78,393,2208,13977,100026,806769,7280604,
 72865089,801693126,9620848953,125072630712,
 1751021612937,26265338542962,420245459734113,
 7144172944620084,128595113390582001,
 2443307155583319486,48866143115153174121]

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.


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