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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 30 |
| 3 | 105 |
| 4 | 249 |
| 5 | 487 |
| 6 | 846 |
| 7 | 1346 |
| 8 | 2012 |
| 9 | 2871 |
| 10 | 3943 |
| 11 | 5253 |
| 12 | 6828 |
| 13 | 8688 |
| 14 | 10858 |
| 15 | 13365 |
| 16 | 16229 |
| 17 | 19475 |
| 18 | 23130 |
| 19 | 27214 |
| 20 | 31752 |
| 21 | 36771 |
| 22 | 42291 |
| 23 | 48337 |
| 24 | 54936 |
| 25 | 62108 |
| 26 | 69878 |
| 27 | 78273 |
| 28 | 87313 |
| 29 | 97023 |
| 30 | 107430 |
| 31 | 118554 |
| 32 | 130420 |
| 33 | 143055 |
| 34 | 156479 |
| 35 | 170717 |
| 36 | 185796 |
| 37 | 201736 |
| 38 | 218562 |
[0,4,30,105,249,487,846,1346,2012,2871,3943,5253, 6828,8688,10858,13365,16229,19475,23130,27214, 31752,36771,42291,48337,54936,62108,69878,78273, 87313,97023,107430,118554,130420,143055,156479, 170717,185796,201736,218562] |