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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 2 |
| 6 | 13 |
| 7 | 56 |
| 8 | 201 |
| 9 | 652 |
| 10 | 1987 |
| 11 | 5812 |
| 12 | 16527 |
| 13 | 46062 |
| 14 | 126511 |
| 15 | 343698 |
| 16 | 926073 |
| 17 | 2479562 |
| 18 | 6606805 |
| 19 | 17537444 |
| 20 | 46415109 |
| 21 | 122559832 |
| 22 | 323033839 |
| 23 | 850211680 |
| 24 | 2235203355 |
| 25 | 5871127002 |
| 26 | 15410683483 |
| 27 | 40428032286 |
| 28 | 106011825381 |
| 29 | 277892656502 |
| 30 | 728253346657 |
| 31 | 1908075342992 |
| 32 | 4998455710257 |
| 33 | 13092392061412 |
| 34 | 34289189456731 |
[0,0,0,0,0,2,13,56,201,652,1987,5812,16527,46062, 126511,343698,926073,2479562,6606805,17537444, 46415109,122559832,323033839,850211680,2235203355, 5871127002,15410683483,40428032286,106011825381, 277892656502,728253346657,1908075342992, 4998455710257,13092392061412,34289189456731] |