n | a(n) |
---|---|
0 | 1 |
1 | 10 |
2 | 21 |
3 | 220 |
4 | 461 |
5 | 4830 |
6 | 10121 |
7 | 106040 |
8 | 222201 |
9 | 2328050 |
10 | 4878301 |
11 | 51111060 |
12 | 107100421 |
13 | 1122115270 |
14 | 2351330961 |
15 | 24635424880 |
16 | 51622180721 |
17 | 540857232090 |
18 | 1133336644901 |
19 | 11874223681100 |
[1,10,21,220,461,4830,10121,106040,222201,2328050, 4878301,51111060,107100421,1122115270,2351330961, 24635424880,51622180721,540857232090, 1133336644901,11874223681100] |