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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 79 |
| 5 | 327 |
| 6 | 1487 |
| 7 | 6677 |
| 8 | 30717 |
| 9 | 142149 |
| 10 | 664989 |
| 11 | 3122187 |
| 12 | 14783737 |
| 13 | 70121443 |
| 14 | 334613209 |
| 15 | 1599628705 |
| 16 | 7675931117 |
| 17 | 36908653065 |
| 18 | 177910757393 |
| 19 | 859149747059 |
| 20 | 4156876166657 |
| 21 | 20141966655907 |
| 22 | 97752117263755 |
| 23 | 474977703967981 |
| 24 | 2310931985472255 |
| 25 | 11255214218375295 |
| 26 | 54876297938703683 |
| 27 | 267802180953226221 |
[1,1,5,17,79,327,1487,6677,30717,142149,664989, 3122187,14783737,70121443,334613209,1599628705, 7675931117,36908653065,177910757393,859149747059, 4156876166657,20141966655907,97752117263755, 474977703967981,2310931985472255, 11255214218375295,54876297938703683, 267802180953226221] |