n | a(n) |
---|---|
1 | 4 |
2 | 48 |
3 | 137 |
4 | 570 |
5 | 2334 |
6 | 9774 |
7 | 40572 |
8 | 169348 |
9 | 704704 |
10 | 2937764 |
11 | 12236817 |
12 | 50996499 |
13 | 212474695 |
14 | 885374358 |
15 | 3689111563 |
16 | 15371973010 |
17 | 64051973628 |
18 | 266893366673 |
19 | 1112095776824 |
20 | 4633902454111 |
21 | 19308634583221 |
22 | 80455590398414 |
[4,48,137,570,2334,9774,40572,169348,704704, 2937764,12236817,50996499,212474695,885374358, 3689111563,15371973010,64051973628,266893366673, 1112095776824,4633902454111,19308634583221, 80455590398414] |