n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 15 |
3 | 155 |
4 | 1854 |
5 | 24124 |
6 | 331575 |
7 | 4736345 |
8 | 69616637 |
9 | 1046054129 |
10 | 15995716263 |
11 | 248111418112 |
12 | 3894303176880 |
13 | 61737213540306 |
14 | 987116931080661 |
15 | 15899835212249761 |
16 | 257758369219909534 |
17 | 4202381519278498915 |
18 | 68859442092723799788 |
19 | 1133401910867109123200 |
[1,2,15,155,1854,24124,331575,4736345,69616637, 1046054129,15995716263,248111418112,3894303176880, 61737213540306,987116931080661,15899835212249761, 257758369219909534,4202381519278498915, 68859442092723799788,1133401910867109123200] |