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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 26 |
| 6 | 70 |
| 7 | 195 |
| 8 | 586 |
| 9 | 1662 |
| 10 | 5068 |
| 11 | 15965 |
| 12 | 50052 |
| 13 | 157178 |
| 14 | 513731 |
| 15 | 1686164 |
| 16 | 5537693 |
| 17 | 18364576 |
| 18 | 62042980 |
| 19 | 210460928 |
| 20 | 712129270 |
| 21 | 2441118300 |
| 22 | 8465730672 |
| 23 | 29229162000 |
| 24 | 101493128823 |
| 25 | 356292793377 |
| 26 | 1251427851901 |
| 27 | 4403651455081 |
| 28 | 15587741497401 |
| 29 | 55409301916782 |
| 30 | 197456798358821 |
| 31 | 704509180319693 |
[1,1,2,4,11,26,70,195,586,1662,5068,15965,50052, 157178,513731,1686164,5537693,18364576,62042980, 210460928,712129270,2441118300,8465730672, 29229162000,101493128823,356292793377, 1251427851901,4403651455081,15587741497401, 55409301916782,197456798358821,704509180319693] |