n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 14 |
4 | 58 |
5 | 229 |
6 | 749 |
7 | 2180 |
8 | 6188 |
9 | 17912 |
10 | 52620 |
11 | 154383 |
12 | 450195 |
13 | 1309452 |
14 | 3811888 |
15 | 11110432 |
16 | 32392550 |
17 | 94412963 |
18 | 275116777 |
19 | 801676752 |
20 | 2336222946 |
21 | 6808405238 |
22 | 19841419978 |
23 | 57821971765 |
24 | 168504312515 |
25 | 491055599116 |
26 | 1431039769316 |
27 | 4170353383134 |
28 | 12153282490316 |
29 | 35417189532323 |
[0,4,14,58,229,749,2180,6188,17912,52620,154383, 450195,1309452,3811888,11110432,32392550,94412963, 275116777,801676752,2336222946,6808405238, 19841419978,57821971765,168504312515,491055599116, 1431039769316,4170353383134,12153282490316, 35417189532323] |