n | a(n) |
---|---|
0 | 1 |
1 | 15 |
2 | 140 |
3 | 1045 |
4 | 6835 |
5 | 40963 |
6 | 230720 |
7 | 1240740 |
8 | 6437890 |
9 | 32468470 |
10 | 160010280 |
11 | 773624615 |
12 | 3680728375 |
13 | 17274086235 |
14 | 80119845080 |
15 | 367821324040 |
16 | 1673528845710 |
17 | 7554110698850 |
18 | 33858536700040 |
19 | 150802994850570 |
[1,15,140,1045,6835,40963,230720,1240740,6437890, 32468470,160010280,773624615,3680728375, 17274086235,80119845080,367821324040, 1673528845710,7554110698850,33858536700040, 150802994850570] |