n | a(n) |
---|---|
7 | 4 |
8 | 60 |
9 | 550 |
10 | 4004 |
11 | 25480 |
12 | 148512 |
13 | 813960 |
14 | 4263600 |
15 | 21573816 |
16 | 106234700 |
17 | 511801290 |
18 | 2421810300 |
19 | 11289642000 |
20 | 51967090560 |
21 | 236635858800 |
22 | 1067518772640 |
23 | 4776759725400 |
24 | 21221827263000 |
25 | 93687293423724 |
26 | 411270420524040 |
27 | 1796296260955504 |
28 | 7809983743284800 |
29 | 33816739954270000 |
[4,60,550,4004,25480,148512,813960,4263600, 21573816,106234700,511801290,2421810300, 11289642000,51967090560,236635858800, 1067518772640,4776759725400,21221827263000, 93687293423724,411270420524040,1796296260955504, 7809983743284800,33816739954270000] |