n | a(n) |
---|---|
0 | 4 |
1 | 14 |
2 | 69 |
3 | 426 |
4 | 2811 |
5 | 18964 |
6 | 129796 |
7 | 894425 |
8 | 6189788 |
9 | 42955634 |
10 | 298658894 |
11 | 2079246204 |
12 | 14489671674 |
13 | 101048453166 |
14 | 705093892472 |
15 | 4922191483150 |
16 | 34373676895999 |
17 | 240115703266097 |
18 | 1677722277599685 |
19 | 11724848294191033 |
20 | 81953661525423276 |
21 | 572918021989157017 |
[4,14,69,426,2811,18964,129796,894425,6189788, 42955634,298658894,2079246204,14489671674, 101048453166,705093892472,4922191483150, 34373676895999,240115703266097,1677722277599685, 11724848294191033,81953661525423276, 572918021989157017] |