| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 26 |
| 5 | 64 |
| 6 | 160 |
| 7 | 396 |
| 8 | 984 |
| 9 | 2440 |
| 10 | 6056 |
| 11 | 15024 |
| 12 | 37280 |
| 13 | 92496 |
| 14 | 229504 |
| 15 | 569440 |
| 16 | 1412896 |
| 17 | 3505664 |
| 18 | 8698240 |
| 19 | 21582016 |
| 20 | 53549184 |
| 21 | 132865920 |
| 22 | 329666176 |
| 23 | 817965824 |
| 24 | 2029532160 |
| 25 | 5035663616 |
| 26 | 12494459904 |
| 27 | 31001182720 |
| 28 | 76919958016 |
| 29 | 190853361664 |
| 30 | 473544273920 |
| 31 | 1174955355136 |
| 32 | 2915292534784 |
[0,1,4,10,26,64,160,396,984,2440,6056,15024,37280, 92496,229504,569440,1412896,3505664,8698240, 21582016,53549184,132865920,329666176,817965824, 2029532160,5035663616,12494459904,31001182720, 76919958016,190853361664,473544273920, 1174955355136,2915292534784] |