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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 31 |
| 4 | 141 |
| 5 | 579 |
| 6 | 2637 |
| 7 | 11658 |
| 8 | 53730 |
| 9 | 245184 |
| 10 | 1145615 |
| 11 | 5316641 |
| 12 | 25100260 |
| 13 | 117875813 |
| 14 | 560486938 |
| 15 | 2655943749 |
| 16 | 12697363185 |
| 17 | 60572829215 |
| 18 | 290883443805 |
| 19 | 1394741066965 |
| 20 | 6722843752887 |
| 21 | 32366602118582 |
| 22 | 156491245246286 |
| 23 | 755964200592160 |
| 24 | 3664456744630402 |
| 25 | 17752096869897428 |
| 26 | 86241013154934282 |
[1,2,9,31,141,579,2637,11658,53730,245184,1145615, 5316641,25100260,117875813,560486938,2655943749, 12697363185,60572829215,290883443805, 1394741066965,6722843752887,32366602118582, 156491245246286,755964200592160,3664456744630402, 17752096869897428,86241013154934282] |