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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 6 |
| 4 | 14 |
| 5 | 24 |
| 6 | 54 |
| 7 | 104 |
| 8 | 230 |
| 9 | 464 |
| 10 | 1028 |
| 11 | 2128 |
| 12 | 4720 |
| 13 | 9918 |
| 14 | 22038 |
| 15 | 46760 |
| 16 | 104056 |
| 17 | 222338 |
| 18 | 495358 |
| 19 | 1064138 |
| 20 | 2373070 |
| 21 | 5119796 |
| 22 | 11425974 |
| 23 | 24738074 |
| 24 | 55242788 |
| 25 | 119958510 |
| 26 | 268018844 |
| 27 | 583462384 |
| 28 | 1304179214 |
| 29 | 2845288284 |
| 30 | 6362293924 |
[1,4,6,14,24,54,104,230,464,1028,2128,4720,9918, 22038,46760,104056,222338,495358,1064138,2373070, 5119796,11425974,24738074,55242788,119958510, 268018844,583462384,1304179214,2845288284, 6362293924] |