n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 18 |
3 | 124 |
4 | 951 |
5 | 7764 |
6 | 66200 |
7 | 582594 |
8 | 5252133 |
9 | 48254668 |
10 | 450186720 |
11 | 4253328540 |
12 | 40612877001 |
13 | 391300954065 |
14 | 3799506069816 |
15 | 37142836241690 |
16 | 365255937037437 |
17 | 3610755090793272 |
18 | 35861607622930556 |
19 | 357670540310182842 |
20 | 3580797575489620740 |
[1,3,18,124,951,7764,66200,582594,5252133, 48254668,450186720,4253328540,40612877001, 391300954065,3799506069816,37142836241690, 365255937037437,3610755090793272, 35861607622930556,357670540310182842, 3580797575489620740] |