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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 21 |
| 4 | 45 |
| 5 | 87 |
| 6 | 159 |
| 7 | 273 |
| 8 | 450 |
| 9 | 712 |
| 10 | 1092 |
| 11 | 1626 |
| 12 | 2364 |
| 13 | 3360 |
| 14 | 4686 |
| 15 | 6420 |
| 16 | 8661 |
| 17 | 11517 |
| 18 | 15121 |
| 19 | 19617 |
| 20 | 25179 |
| 21 | 31995 |
| 22 | 40287 |
| 23 | 50295 |
| 24 | 62298 |
| 25 | 76596 |
| 26 | 93534 |
| 27 | 113482 |
| 28 | 136860 |
| 29 | 164118 |
| 30 | 195762 |
| 31 | 232332 |
| 32 | 274431 |
| 33 | 322701 |
| 34 | 377853 |
| 35 | 440643 |
| 36 | 511903 |
| 37 | 592515 |
| 38 | 683445 |
| 39 | 785715 |
[1,3,9,21,45,87,159,273,450,712,1092,1626,2364, 3360,4686,6420,8661,11517,15121,19617,25179,31995, 40287,50295,62298,76596,93534,113482,136860, 164118,195762,232332,274431,322701,377853,440643, 511903,592515,683445,785715] |