n | a(n) |
---|---|
4 | 1 |
5 | 15 |
6 | 90 |
7 | 357 |
8 | 1107 |
9 | 2907 |
10 | 6765 |
11 | 14355 |
12 | 28314 |
13 | 52624 |
14 | 93093 |
15 | 157950 |
16 | 258570 |
17 | 410346 |
18 | 633726 |
19 | 955434 |
20 | 1409895 |
21 | 2040885 |
22 | 2903428 |
23 | 4065963 |
24 | 5612805 |
25 | 7646925 |
26 | 10293075 |
27 | 13701285 |
28 | 18050760 |
29 | 23554206 |
30 | 30462615 |
31 | 39070540 |
32 | 49721892 |
[1,15,90,357,1107,2907,6765,14355,28314,52624, 93093,157950,258570,410346,633726,955434,1409895, 2040885,2903428,4065963,5612805,7646925,10293075, 13701285,18050760,23554206,30462615,39070540, 49721892] |