n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 13 |
4 | 21 |
5 | 24 |
6 | 225 |
7 | 615 |
8 | 17450 |
9 | 23228 |
10 | 57774 |
11 | 221361 |
12 | 522377 |
13 | 793040 |
14 | 1706305 |
15 | 8664354 |
16 | 19037086 |
17 | 51965160 |
18 | 56870701 |
19 | 124645388 |
20 | 784244500 |
21 | 792809072 |
22 | 3675221276 |
23 | 42108268014 |
24 | 53633289500 |
25 | 56827261536 |
26 | 67080647365 |
[1,2,6,13,21,24,225,615,17450,23228,57774,221361, 522377,793040,1706305,8664354,19037086,51965160, 56870701,124645388,784244500,792809072,3675221276, 42108268014,53633289500,56827261536,67080647365] |