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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 10 |
| 2 | 20 |
| 3 | 62 |
| 4 | 106 |
| 5 | 254 |
| 6 | 408 |
| 7 | 874 |
| 8 | 1342 |
| 9 | 2698 |
| 10 | 4012 |
| 11 | 7770 |
| 12 | 11150 |
| 13 | 21216 |
| 14 | 29574 |
| 15 | 55594 |
| 16 | 75084 |
| 17 | 141436 |
| 18 | 184608 |
| 19 | 350604 |
| 20 | 440492 |
| 21 | 852904 |
| 22 | 1025072 |
| 23 | 2040700 |
| 24 | 2328008 |
| 25 | 4826128 |
| 26 | 5161920 |
| 27 | 11312176 |
| 28 | 11161948 |
| 29 | 26339890 |
| 30 | 23503678 |
[2,10,20,62,106,254,408,874,1342,2698,4012,7770, 11150,21216,29574,55594,75084,141436,184608, 350604,440492,852904,1025072,2040700,2328008, 4826128,5161920,11312176,11161948,26339890, 23503678] |