| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 6 |
| 6 | 21 |
| 7 | 54 |
| 8 | 116 |
| 9 | 220 |
| 10 | 383 |
| 11 | 623 |
| 12 | 962 |
| 13 | 1424 |
| 14 | 2034 |
| 15 | 2821 |
| 16 | 3817 |
| 17 | 5053 |
| 18 | 6565 |
| 19 | 8391 |
| 20 | 10569 |
| 21 | 13142 |
| 22 | 16153 |
| 23 | 19646 |
| 24 | 23671 |
| 25 | 28274 |
| 26 | 33509 |
| 27 | 39426 |
| 28 | 46082 |
| 29 | 53533 |
| 30 | 61836 |
| 31 | 71051 |
| 32 | 81240 |
| 33 | 92466 |
| 34 | 104793 |
| 35 | 118288 |
| 36 | 133018 |
| 37 | 149054 |
| 38 | 166464 |
| 39 | 185324 |
| 40 | 205704 |
| 41 | 227683 |
| 42 | 251334 |
[1,6,21,54,116,220,383,623,962,1424,2034,2821, 3817,5053,6565,8391,10569,13142,16153,19646,23671, 28274,33509,39426,46082,53533,61836,71051,81240, 92466,104793,118288,133018,149054,166464,185324, 205704,227683,251334] |