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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 4 |
| 3 | 10 |
| 4 | 21 |
| 5 | 39 |
| 6 | 68 |
| 7 | 114 |
| 8 | 186 |
| 9 | 297 |
| 10 | 465 |
| 11 | 714 |
| 12 | 1075 |
| 13 | 1587 |
| 14 | 2298 |
| 15 | 3266 |
| 16 | 4560 |
| 17 | 6261 |
| 18 | 8463 |
| 19 | 11274 |
| 20 | 14817 |
| 21 | 19231 |
| 22 | 24672 |
| 23 | 31314 |
| 24 | 39350 |
| 25 | 48993 |
| 26 | 60477 |
| 27 | 74058 |
| 28 | 90015 |
| 29 | 108651 |
| 30 | 130294 |
| 31 | 155298 |
| 32 | 184044 |
| 33 | 216941 |
| 34 | 254427 |
| 35 | 296970 |
| 36 | 345069 |
| 37 | 399255 |
| 38 | 460092 |
| 39 | 528178 |
[4,4,10,21,39,68,114,186,297,465,714,1075,1587, 2298,3266,4560,6261,8463,11274,14817,19231,24672, 31314,39350,48993,60477,74058,90015,108651,130294, 155298,184044,216941,254427,296970,345069,399255, 460092,528178] |