| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 106 |
| 2 | 541 |
| 3 | 2432 |
| 4 | 10307 |
| 5 | 42438 |
| 6 | 172233 |
| 7 | 693964 |
| 8 | 2785999 |
| 9 | 11164370 |
| 10 | 44698325 |
| 11 | 178875096 |
| 12 | 715664091 |
| 13 | 2862983902 |
| 14 | 11452590817 |
| 15 | 45811673828 |
| 16 | 183249316583 |
| 17 | 733002509034 |
| 18 | 2932020521709 |
| 19 | 11728103058160 |
| 20 | 46912454175475 |
| 21 | 187649900587766 |
| 22 | 750599770123001 |
| 23 | 3002399416036092 |
[15,106,541,2432,10307,42438,172233,693964, 2785999,11164370,44698325,178875096,715664091, 2862983902,11452590817,45811673828,183249316583, 733002509034,2932020521709,11728103058160, 46912454175475,187649900587766,750599770123001, 3002399416036092] |