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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 120 |
| 4 | 528 |
| 5 | 1540 |
| 6 | 3916 |
| 7 | 8385 |
| 8 | 16471 |
| 9 | 29646 |
| 10 | 50086 |
| 11 | 80601 |
| 12 | 124251 |
| 13 | 185745 |
| 14 | 269011 |
| 15 | 379756 |
| 16 | 524800 |
| 17 | 709836 |
| 18 | 944625 |
| 19 | 1237951 |
| 20 | 1599366 |
| 21 | 2041210 |
| 22 | 2577585 |
| 23 | 3216916 |
| 24 | 3980431 |
| 25 | 4884375 |
| 26 | 5939181 |
| 27 | 7172578 |
| 28 | 8605026 |
| 29 | 10253656 |
| 30 | 12149985 |
| 31 | 14313925 |
| 32 | 16776528 |
| 33 | 19565640 |
| 34 | 22717170 |
| 35 | 26263128 |
| 36 | 30236976 |
| 37 | 34673628 |
[1,15,120,528,1540,3916,8385,16471,29646,50086, 80601,124251,185745,269011,379756,524800,709836, 944625,1237951,1599366,2041210,2577585,3216916, 3980431,4884375,5939181,7172578,8605026,10253656, 12149985,14313925,16776528,19565640,22717170, 26263128,30236976,34673628] |