n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 70 |
5 | 250 |
6 | 910 |
7 | 3362 |
8 | 12562 |
9 | 47316 |
10 | 179340 |
11 | 683300 |
12 | 2615034 |
13 | 10045386 |
14 | 38709710 |
15 | 149568252 |
16 | 579264594 |
17 | 2248081292 |
18 | 8740576452 |
19 | 34038561714 |
20 | 132748629244 |
21 | 518386521518 |
22 | 2026694854474 |
23 | 7932078176602 |
24 | 31074793596262 |
25 | 121847340688340 |
26 | 478166110438380 |
27 | 1877883164711372 |
[1,2,6,20,70,250,910,3362,12562,47316,179340, 683300,2615034,10045386,38709710,149568252, 579264594,2248081292,8740576452,34038561714, 132748629244,518386521518,2026694854474, 7932078176602,31074793596262,121847340688340, 478166110438380,1877883164711372] |