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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 16 |
| 4 | 36 |
| 5 | 172 |
| 6 | 764 |
| 7 | 2728 |
| 8 | 9880 |
| 9 | 38818 |
| 10 | 150536 |
| 11 | 567680 |
| 12 | 2152907 |
| 13 | 8249172 |
| 14 | 31505782 |
| 15 | 119890865 |
| 16 | 456906182 |
| 17 | 1743546208 |
| 18 | 6648727988 |
| 19 | 25342679205 |
| 20 | 96627142521 |
| 21 | 368474752553 |
| 22 | 1404944654910 |
| 23 | 5356632127953 |
| 24 | 20424348993729 |
[0,5,16,36,172,764,2728,9880,38818,150536,567680, 2152907,8249172,31505782,119890865,456906182, 1743546208,6648727988,25342679205,96627142521, 368474752553,1404944654910,5356632127953, 20424348993729] |