n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 7 |
4 | 30 |
5 | 69 |
6 | 305 |
7 | 821 |
8 | 3706 |
9 | 10951 |
10 | 50167 |
11 | 157879 |
12 | 731126 |
13 | 2409735 |
14 | 11251900 |
15 | 38416059 |
16 | 180553280 |
17 | 633903339 |
18 | 2995076713 |
19 | 10757081251 |
20 | 51047312394 |
21 | 186835993771 |
22 | 889875336356 |
23 | 3309417001979 |
24 | 15811570006020 |
25 | 59613630920579 |
26 | 285586423605813 |
27 | 1089612947988583 |
28 | 5232179206138834 |
[1,1,4,7,30,69,305,821,3706,10951,50167,157879, 731126,2409735,11251900,38416059,180553280, 633903339,2995076713,10757081251,51047312394, 186835993771,889875336356,3309417001979, 15811570006020,59613630920579,285586423605813, 1089612947988583,5232179206138834] |