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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 16 |
| 3 | 92 |
| 4 | 464 |
| 5 | 2182 |
| 6 | 9824 |
| 7 | 42936 |
| 8 | 183648 |
| 9 | 772746 |
| 10 | 3209968 |
| 11 | 13196564 |
| 12 | 53791408 |
| 13 | 217700110 |
| 14 | 875718080 |
| 15 | 3504277360 |
| 16 | 13959102912 |
| 17 | 55383875346 |
| 18 | 218965651152 |
| 19 | 862983998924 |
| 20 | 3391602170512 |
| 21 | 13295446717334 |
| 22 | 51999641009696 |
| 23 | 202948920530728 |
| 24 | 790569797639456 |
| 25 | 3074179492922778 |
[0,2,16,92,464,2182,9824,42936,183648,772746, 3209968,13196564,53791408,217700110,875718080, 3504277360,13959102912,55383875346,218965651152, 862983998924,3391602170512,13295446717334, 51999641009696,202948920530728,790569797639456, 3074179492922778] |