n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 62 |
4 | 239 |
5 | 920 |
6 | 3540 |
7 | 13620 |
8 | 52401 |
9 | 201604 |
10 | 775636 |
11 | 2984122 |
12 | 11480879 |
13 | 44170640 |
14 | 169938680 |
15 | 653808840 |
16 | 2515413201 |
17 | 9677604804 |
18 | 37232862856 |
19 | 143246816182 |
20 | 551116641919 |
21 | 2120323237160 |
22 | 8157566453420 |
23 | 31384785713660 |
24 | 120747379738401 |
[1,4,16,62,239,920,3540,13620,52401,201604,775636, 2984122,11480879,44170640,169938680,653808840, 2515413201,9677604804,37232862856,143246816182, 551116641919,2120323237160,8157566453420, 31384785713660,120747379738401] |