n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 47 |
5 | 155 |
6 | 545 |
7 | 1982 |
8 | 7366 |
9 | 28040 |
10 | 108465 |
11 | 425789 |
12 | 1698808 |
13 | 6859370 |
14 | 27955680 |
15 | 114943633 |
16 | 476154065 |
17 | 1986712591 |
18 | 8348735338 |
19 | 35294521877 |
20 | 149972186973 |
21 | 640252876498 |
22 | 2745195496472 |
23 | 11820325855569 |
24 | 51102650867725 |
25 | 221726509972662 |
26 | 965121780389572 |
27 | 4213436370834023 |
[1,2,5,15,47,155,545,1982,7366,28040,108465, 425789,1698808,6859370,27955680,114943633, 476154065,1986712591,8348735338,35294521877, 149972186973,640252876498,2745195496472, 11820325855569,51102650867725,221726509972662, 965121780389572,4213436370834023] |