n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 21 |
5 | 67 |
6 | 212 |
7 | 673 |
8 | 2136 |
9 | 6781 |
10 | 21527 |
11 | 68341 |
12 | 216960 |
13 | 688777 |
14 | 2186642 |
15 | 6941875 |
16 | 22038189 |
17 | 69964063 |
18 | 222113084 |
19 | 705136609 |
20 | 2238578784 |
21 | 7106757625 |
22 | 22561637903 |
23 | 71625842857 |
24 | 227388693456 |
25 | 721884948913 |
26 | 2291749301810 |
27 | 7275556680127 |
28 | 23097519856965 |
29 | 73327093306843 |
30 | 232789608846644 |
[0,1,2,7,21,67,212,673,2136,6781,21527,68341, 216960,688777,2186642,6941875,22038189,69964063, 222113084,705136609,2238578784,7106757625, 22561637903,71625842857,227388693456,721884948913, 2291749301810,7275556680127,23097519856965, 73327093306843,232789608846644] |