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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 4 |
| 10 | 15 |
| 11 | 41 |
| 12 | 99 |
| 13 | 214 |
| 14 | 429 |
| 15 | 804 |
| 16 | 1430 |
| 17 | 2431 |
| 18 | 3978 |
| 19 | 6298 |
| 20 | 9690 |
| 21 | 14535 |
| 22 | 21318 |
| 23 | 30644 |
| 24 | 43263 |
| 25 | 60087 |
| 26 | 82225 |
| 27 | 111003 |
| 28 | 148005 |
| 29 | 195097 |
| 30 | 254475 |
| 31 | 328696 |
| 32 | 420732 |
| 33 | 534006 |
| 34 | 672452 |
| 35 | 840565 |
| 36 | 1043460 |
[0,0,0,0,0,0,0,0,1,4,15,41,99,214,429,804,1430, 2431,3978,6298,9690,14535,21318,30644,43263,60087, 82225,111003,148005,195097,254475,328696,420732, 534006,672452,840565,1043460] |