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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 28 |
| 4 | 128 |
| 5 | 520 |
| 6 | 2464 |
| 7 | 10768 |
| 8 | 51968 |
| 9 | 236384 |
| 10 | 1153024 |
| 11 | 5376064 |
| 12 | 26398464 |
| 13 | 125124224 |
| 14 | 617141248 |
| 15 | 2958910208 |
| 16 | 14639308800 |
| 17 | 70775611904 |
| 18 | 350949025792 |
| 19 | 1707297825792 |
| 20 | 8479898378240 |
| 21 | 41449973364736 |
| 22 | 206135378673664 |
| 23 | 1011348721979392 |
| 24 | 5034447141519360 |
| 25 | 24773189924233216 |
| 26 | 123413984980369408 |
[1,2,8,28,128,520,2464,10768,51968,236384,1153024, 5376064,26398464,125124224,617141248,2958910208, 14639308800,70775611904,350949025792, 1707297825792,8479898378240,41449973364736, 206135378673664,1011348721979392,5034447141519360, 24773189924233216,123413984980369408] |