n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 15 |
5 | 74 |
6 | 427 |
7 | 2901 |
8 | 22624 |
9 | 199095 |
10 | 1951127 |
11 | 21072175 |
12 | 248651668 |
13 | 3182741351 |
14 | 43921830648 |
15 | 650043093588 |
16 | 10270680878694 |
17 | 172547438762056 |
18 | 3071344409964594 |
19 | 57741274907334370 |
20 | 1143277243165220534 |
[1,1,1,4,15,74,427,2901,22624,199095,1951127, 21072175,248651668,3182741351,43921830648, 650043093588,10270680878694,172547438762056, 3071344409964594,57741274907334370, 1143277243165220534] |