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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 28 |
| 4 | 122 |
| 5 | 496 |
| 6 | 2256 |
| 7 | 9758 |
| 8 | 45330 |
| 9 | 203168 |
| 10 | 957032 |
| 11 | 4384498 |
| 12 | 20844492 |
| 13 | 96970229 |
| 14 | 464178852 |
| 15 | 2183124710 |
| 16 | 10503864829 |
| 17 | 49816232559 |
| 18 | 240665055849 |
| 19 | 1148760209125 |
| 20 | 5567836855452 |
| 21 | 26714991278863 |
| 22 | 129834147642432 |
| 23 | 625571531369695 |
| 24 | 3047129448094499 |
| 25 | 14733209890996245 |
| 26 | 71903582700108710 |
[1,2,8,28,122,496,2256,9758,45330,203168,957032, 4384498,20844492,96970229,464178852,2183124710, 10503864829,49816232559,240665055849, 1148760209125,5567836855452,26714991278863, 129834147642432,625571531369695,3047129448094499, 14733209890996245,71903582700108710] |