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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 17 |
| 4 | 226 |
| 5 | 1550 |
| 6 | 7221 |
| 7 | 26120 |
| 8 | 78484 |
| 9 | 206242 |
| 10 | 486640 |
| 11 | 1056377 |
| 12 | 2137506 |
| 13 | 4085167 |
| 14 | 7430276 |
| 15 | 12964014 |
| 16 | 21801632 |
| 17 | 35520743 |
| 18 | 56249658 |
| 19 | 86880957 |
| 20 | 131186720 |
| 21 | 194133425 |
| 22 | 282024809 |
| 23 | 402949496 |
| 24 | 566950056 |
| 25 | 786640454 |
| 26 | 1077397347 |
| 27 | 1458190435 |
| 28 | 1951789266 |
| 29 | 2585856152 |
| 30 | 3393157995 |
[0,1,17,226,1550,7221,26120,78484,206242,486640, 1056377,2137506,4085167,7430276,12964014,21801632, 35520743,56249658,86880957,131186720,194133425, 282024809,402949496,566950056,786640454, 1077397347,1458190435,1951789266,2585856152, 3393157995] |