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A049683 formatted as a simple table:

n a(n)
0 0
1 1
2 20
3 361
4 6480
5 116281
6 2086580
7 37442161
8 671872320
9 12056259601
10 216340800500
11 3882078149401
12 69661065888720 

[0,1,20,361,6480,116281,2086580,37442161,
 671872320,12056259601,216340800500,3882078149401,
 69661065888720]

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

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