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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 10 |
| 3 | 26 |
| 4 | 100 |
| 5 | 342 |
| 6 | 1210 |
| 7 | 4240 |
| 8 | 14898 |
| 9 | 52306 |
| 10 | 183684 |
| 11 | 645006 |
| 12 | 2264978 |
| 13 | 7953568 |
| 14 | 27929338 |
| 15 | 98075178 |
| 16 | 344395620 |
| 17 | 1209361446 |
| 18 | 4246729738 |
| 19 | 14912591664 |
| 20 | 52366268642 |
| 21 | 183886620962 |
| 22 | 645726538244 |
| 23 | 2267499179678 |
| 24 | 7962430263202 |
| 25 | 27960449231680 |
| 26 | 98184435580010 |
[0,10,26,100,342,1210,4240,14898,52306,183684, 645006,2264978,7953568,27929338,98075178, 344395620,1209361446,4246729738,14912591664, 52366268642,183886620962,645726538244, 2267499179678,7962430263202,27960449231680, 98184435580010] |