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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 12 |
| 3 | 33 |
| 4 | 72 |
| 5 | 145 |
| 6 | 252 |
| 7 | 413 |
| 8 | 624 |
| 9 | 909 |
| 10 | 1300 |
| 11 | 1771 |
| 12 | 2376 |
| 13 | 3107 |
| 14 | 3948 |
| 15 | 4935 |
| 16 | 6112 |
| 17 | 7497 |
| 18 | 9036 |
| 19 | 10811 |
| 20 | 12800 |
| 21 | 14973 |
| 22 | 17424 |
| 23 | 20125 |
| 24 | 23136 |
| 25 | 26525 |
| 26 | 30212 |
| 27 | 34155 |
| 28 | 38416 |
| 29 | 42949 |
| 30 | 47820 |
| 31 | 53351 |
| 32 | 59264 |
| 33 | 65637 |
| 34 | 72352 |
| 35 | 79695 |
| 36 | 87408 |
| 37 | 95645 |
| 38 | 104424 |
| 39 | 113685 |
| 40 | 123520 |
| 41 | 133947 |
[0,3,12,33,72,145,252,413,624,909,1300,1771,2376, 3107,3948,4935,6112,7497,9036,10811,12800,14973, 17424,20125,23136,26525,30212,34155,38416,42949, 47820,53351,59264,65637,72352,79695,87408,95645, 104424,113685,123520,133947] |