n | a(n) |
---|---|
3 | 1 |
4 | 6 |
5 | 25 |
6 | 90 |
7 | 302 |
8 | 994 |
9 | 3487 |
10 | 15210 |
11 | 92489 |
12 | 713988 |
13 | 5979480 |
14 | 50184316 |
15 | 412595913 |
16 | 3317961318 |
17 | 26241631409 |
18 | 205918294518 |
19 | 1622545217510 |
20 | 13045429410974 |
21 | 109152638729439 |
22 | 969395726250226 |
23 | 9255388478615017 |
24 | 94973500733767432 |
25 | 1034488089509527120 |
[1,6,25,90,302,994,3487,15210,92489,713988, 5979480,50184316,412595913,3317961318,26241631409, 205918294518,1622545217510,13045429410974, 109152638729439,969395726250226,9255388478615017, 94973500733767432,1034488089509527120] |