n | a(n) |
---|---|
0 | 1 |
1 | 7 |
2 | 35 |
3 | 140 |
4 | 490 |
5 | 1554 |
6 | 4578 |
7 | 12720 |
8 | 33705 |
9 | 85855 |
10 | 211519 |
11 | 506408 |
12 | 1182650 |
13 | 2702350 |
14 | 6056850 |
15 | 13343820 |
16 | 28947240 |
17 | 61926900 |
18 | 130814600 |
19 | 273163100 |
20 | 564415390 |
21 | 1154933230 |
22 | 2342193350 |
23 | 4710707400 |
24 | 9401674275 |
25 | 18629923053 |
26 | 36670044621 |
27 | 71728832280 |
28 | 139485074370 |
[1,7,35,140,490,1554,4578,12720,33705,85855, 211519,506408,1182650,2702350,6056850,13343820, 28947240,61926900,130814600,273163100,564415390, 1154933230,2342193350,4710707400,9401674275, 18629923053,36670044621,71728832280,139485074370] |