n | a(n) |
---|---|
2 | -1 |
3 | -1 |
4 | 5 |
5 | 25 |
6 | 70 |
7 | 154 |
8 | 294 |
9 | 510 |
10 | 825 |
11 | 1265 |
12 | 1859 |
13 | 2639 |
14 | 3640 |
15 | 4900 |
16 | 6460 |
17 | 8364 |
18 | 10659 |
19 | 13395 |
20 | 16625 |
21 | 20405 |
22 | 24794 |
23 | 29854 |
24 | 35650 |
25 | 42250 |
26 | 49725 |
27 | 58149 |
28 | 67599 |
29 | 78155 |
30 | 89900 |
31 | 102920 |
32 | 117304 |
33 | 133144 |
34 | 150535 |
35 | 169575 |
36 | 190365 |
37 | 213009 |
38 | 237614 |
39 | 264290 |
40 | 293150 |
41 | 324310 |
42 | 357889 |
43 | 394009 |
44 | 432795 |
45 | 474375 |
[-1,-1,5,25,70,154,294,510,825,1265,1859,2639, 3640,4900,6460,8364,10659,13395,16625,20405,24794, 29854,35650,42250,49725,58149,67599,78155,89900, 102920,117304,133144,150535,169575,190365,213009, 237614,264290,293150,324310,357889,394009,432795, 474375] |