n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 75 |
4 | 288 |
5 | 1094 |
6 | 4171 |
7 | 15897 |
8 | 60565 |
9 | 230816 |
10 | 879521 |
11 | 3351544 |
12 | 12771524 |
13 | 48667365 |
14 | 185453453 |
15 | 706693601 |
16 | 2692945820 |
17 | 10261812539 |
18 | 39103937948 |
19 | 149010523846 |
20 | 567823518619 |
21 | 2163763618201 |
22 | 8245296020629 |
23 | 31419747421972 |
24 | 119728937140293 |
25 | 456242317652464 |
26 | 1738569283271528 |
[1,5,20,75,288,1094,4171,15897,60565,230816, 879521,3351544,12771524,48667365,185453453, 706693601,2692945820,10261812539,39103937948, 149010523846,567823518619,2163763618201, 8245296020629,31419747421972,119728937140293, 456242317652464,1738569283271528] |