n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 3 |
3 | 52 |
4 | 390 |
5 | 1860 |
6 | 6665 |
7 | 19608 |
8 | 49932 |
9 | 113880 |
10 | 238095 |
11 | 463980 |
12 | 853138 |
13 | 1494012 |
14 | 2509845 |
15 | 4068080 |
16 | 6391320 |
17 | 9769968 |
18 | 14576667 |
19 | 21282660 |
20 | 30476190 |
21 | 42883060 |
22 | 59389473 |
23 | 81067272 |
24 | 109201700 |
25 | 145321800 |
26 | 191233575 |
27 | 249056028 |
28 | 321260202 |
29 | 410711340 |
30 | 520714285 |
[0,0,3,52,390,1860,6665,19608,49932,113880,238095, 463980,853138,1494012,2509845,4068080,6391320, 9769968,14576667,21282660,30476190,42883060, 59389473,81067272,109201700,145321800,191233575, 249056028,321260202,410711340,520714285] |