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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 3 |
| 4 | 7 |
| 5 | 9 |
| 6 | 18 |
| 7 | 24 |
| 8 | 47 |
| 9 | 63 |
| 10 | 123 |
| 11 | 165 |
| 12 | 322 |
| 13 | 432 |
| 14 | 843 |
| 15 | 1131 |
| 16 | 2207 |
| 17 | 2961 |
| 18 | 5778 |
| 19 | 7752 |
| 20 | 15127 |
| 21 | 20295 |
| 22 | 39603 |
| 23 | 53133 |
| 24 | 103682 |
| 25 | 139104 |
| 26 | 271443 |
| 27 | 364179 |
| 28 | 710647 |
| 29 | 953433 |
| 30 | 1860498 |
| 31 | 2496120 |
| 32 | 4870847 |
| 33 | 6534927 |
| 34 | 12752043 |
| 35 | 17108661 |
| 36 | 33385282 |
| 37 | 44791056 |
[0,3,3,7,9,18,24,47,63,123,165,322,432,843,1131, 2207,2961,5778,7752,15127,20295,39603,53133, 103682,139104,271443,364179,710647,953433,1860498, 2496120,4870847,6534927,12752043,17108661, 33385282,44791056] |