n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 19 |
4 | 68 |
5 | 255 |
6 | 1020 |
7 | 4221 |
8 | 18186 |
9 | 80304 |
10 | 364476 |
11 | 1684782 |
12 | 7944156 |
13 | 37988379 |
14 | 184406508 |
15 | 905147815 |
16 | 4495346570 |
17 | 22527055980 |
18 | 113957354940 |
19 | 580759868910 |
20 | 2982724210440 |
21 | 15414453711930 |
22 | 80177422383240 |
23 | 419249099692710 |
24 | 2204316120027420 |
25 | 11642676960438000 |
[1,2,6,19,68,255,1020,4221,18186,80304,364476, 1684782,7944156,37988379,184406508,905147815, 4495346570,22527055980,113957354940,580759868910, 2982724210440,15414453711930,80177422383240, 419249099692710,2204316120027420, 11642676960438000] |