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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 24 |
| 6 | 60 |
| 7 | 110 |
| 8 | 238 |
| 9 | 436 |
| 10 | 860 |
| 11 | 1516 |
| 12 | 2848 |
| 13 | 4874 |
| 14 | 8666 |
| 15 | 14664 |
| 16 | 25120 |
| 17 | 41342 |
| 18 | 69178 |
| 19 | 111596 |
| 20 | 181890 |
| 21 | 289170 |
| 22 | 461086 |
| 23 | 720944 |
| 24 | 1131358 |
| 25 | 1743016 |
| 26 | 2689332 |
| 27 | 4094090 |
| 28 | 6228298 |
| 29 | 9364440 |
| 30 | 14072828 |
| 31 | 20926402 |
| 32 | 31080270 |
| 33 | 45767490 |
| 34 | 67255096 |
| 35 | 98095260 |
| 36 | 142805322 |
[0,2,4,12,24,60,110,238,436,860,1516,2848,4874, 8666,14664,25120,41342,69178,111596,181890,289170, 461086,720944,1131358,1743016,2689332,4094090, 6228298,9364440,14072828,20926402,31080270, 45767490,67255096,98095260,142805322] |