n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 13 |
3 | 28 |
4 | 181 |
5 | 390 |
6 | 2521 |
7 | 5432 |
8 | 35113 |
9 | 75658 |
10 | 489061 |
11 | 1053780 |
12 | 6811741 |
13 | 14677262 |
14 | 94875313 |
15 | 204427888 |
16 | 1321442641 |
17 | 2847313170 |
18 | 18405321661 |
19 | 39657956492 |
20 | 256353060613 |
21 | 552364077718 |
22 | 3570537526921 |
[1,2,13,28,181,390,2521,5432,35113,75658,489061, 1053780,6811741,14677262,94875313,204427888, 1321442641,2847313170,18405321661,39657956492, 256353060613,552364077718,3570537526921] |