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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 11 |
| 6 | 34 |
| 7 | 87 |
| 8 | 279 |
| 9 | 897 |
| 10 | 3129 |
| 11 | 11458 |
| 12 | 44576 |
| 13 | 181071 |
| 14 | 770237 |
| 15 | 3407332 |
| 16 | 15641159 |
| 17 | 74270464 |
| 18 | 364014060 |
| 19 | 1837689540 |
| 20 | 9540175803 |
| 21 | 50853577811 |
| 22 | 277976050975 |
| 23 | 1556372791835 |
| 24 | 8916484189284 |
| 25 | 52220798342832 |
| 26 | 312389223102731 |
| 27 | 1907282708797831 |
| 28 | 11876576923779692 |
| 29 | 75376983176576501 |
| 30 | 487295169002095058 |
[1,0,1,2,5,11,34,87,279,897,3129,11458,44576, 181071,770237,3407332,15641159,74270464,364014060, 1837689540,9540175803,50853577811,277976050975, 1556372791835,8916484189284,52220798342832, 312389223102731,1907282708797831, 11876576923779692,75376983176576501, 487295169002095058] |