n | a(n) |
---|---|
1 | 10 |
2 | 60 |
3 | 336 |
4 | 1776 |
5 | 8914 |
6 | 43202 |
7 | 203560 |
8 | 939730 |
9 | 4266332 |
10 | 19120668 |
11 | 84774066 |
12 | 372587962 |
13 | 1625370614 |
14 | 7046239064 |
15 | 30380655534 |
16 | 130376624746 |
17 | 557189663232 |
18 | 2372600434880 |
19 | 10070044493366 |
20 | 42616195500252 |
21 | 179877106083440 |
[10,60,336,1776,8914,43202,203560,939730,4266332, 19120668,84774066,372587962,1625370614,7046239064, 30380655534,130376624746,557189663232, 2372600434880,10070044493366,42616195500252, 179877106083440] |