| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 13 |
| 3 | 48 |
| 4 | 141 |
| 5 | 312 |
| 6 | 652 |
| 7 | 1160 |
| 8 | 1978 |
| 9 | 3106 |
| 10 | 4775 |
| 11 | 6826 |
| 12 | 9803 |
| 13 | 13328 |
| 14 | 17904 |
| 15 | 23536 |
| 16 | 30652 |
| 17 | 38640 |
| 18 | 48945 |
| 19 | 60300 |
| 20 | 74248 |
| 21 | 89892 |
| 22 | 108768 |
| 23 | 128990 |
| 24 | 153826 |
| 25 | 180206 |
| 26 | 211483 |
| 27 | 245000 |
| 28 | 284375 |
| 29 | 325140 |
| 30 | 374450 |
| 31 | 425312 |
| 32 | 484168 |
| 33 | 545938 |
| 34 | 616981 |
| 35 | 690132 |
| 36 | 775077 |
| 37 | 862220 |
[0,2,13,48,141,312,652,1160,1978,3106,4775,6826, 9803,13328,17904,23536,30652,38640,48945,60300, 74248,89892,108768,128990,153826,180206,211483, 245000,284375,325140,374450,425312,484168,545938, 616981,690132,775077,862220] |