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| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | 3 |
| 1 | 6 |
| 2 | 13 |
| 3 | 24 |
| 4 | 42 |
| 5 | 73 |
| 6 | 120 |
| 7 | 192 |
| 8 | 299 |
| 9 | 456 |
| 10 | 684 |
| 11 | 1007 |
| 12 | 1464 |
| 13 | 2100 |
| 14 | 2976 |
| 15 | 4176 |
| 16 | 5802 |
| 17 | 7993 |
| 18 | 10920 |
| 19 | 14808 |
| 20 | 19946 |
| 21 | 26688 |
| 22 | 35496 |
| 23 | 46944 |
| 24 | 61752 |
| 25 | 80826 |
| 26 | 105286 |
| 27 | 136536 |
| 28 | 176304 |
| 29 | 226725 |
| 30 | 290448 |
| 31 | 370704 |
| 32 | 471467 |
| 33 | 597600 |
| 34 | 755028 |
| 35 | 950980 |
| 36 | 1194216 |
[1,3,6,13,24,42,73,120,192,299,456,684,1007,1464, 2100,2976,4176,5802,7993,10920,14808,19946,26688, 35496,46944,61752,80826,105286,136536,176304, 226725,290448,370704,471467,597600,755028,950980, 1194216] |