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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 34 |
| 4 | 157 |
| 5 | 740 |
| 6 | 3559 |
| 7 | 17279 |
| 8 | 84560 |
| 9 | 415909 |
| 10 | 2053550 |
| 11 | 10167290 |
| 12 | 50445068 |
| 13 | 250679582 |
| 14 | 1247241773 |
| 15 | 6211477817 |
| 16 | 30957382262 |
| 17 | 154379894612 |
| 18 | 770234085562 |
| 19 | 3844323126635 |
| 20 | 19193341885245 |
| 21 | 95849502655529 |
| 22 | 478759938038077 |
| 23 | 2391764922831018 |
| 24 | 11950308222386767 |
| 25 | 59715800638647240 |
| 26 | 298428643759601008 |
[1,2,8,34,157,740,3559,17279,84560,415909,2053550, 10167290,50445068,250679582,1247241773,6211477817, 30957382262,154379894612,770234085562, 3844323126635,19193341885245,95849502655529, 478759938038077,2391764922831018, 11950308222386767,59715800638647240, 298428643759601008] |