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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 21 |
| 5 | 73 |
| 6 | 237 |
| 7 | 702 |
| 8 | 1881 |
| 9 | 4577 |
| 10 | 10216 |
| 11 | 21158 |
| 12 | 41097 |
| 13 | 75561 |
| 14 | 132523 |
| 15 | 223134 |
| 16 | 362589 |
| 17 | 571137 |
| 18 | 875246 |
| 19 | 1308934 |
| 20 | 1915277 |
| 21 | 2748105 |
| 22 | 3873897 |
| 23 | 5373886 |
| 24 | 7346385 |
| 25 | 9909345 |
| 26 | 13203156 |
| 27 | 17393702 |
| 28 | 22675681 |
| 29 | 29276201 |
| 30 | 37458663 |
| 31 | 47526942 |
| 32 | 59829877 |
| 33 | 74766081 |
| 34 | 92789082 |
[1,1,2,6,21,73,237,702,1881,4577,10216,21158, 41097,75561,132523,223134,362589,571137,875246, 1308934,1915277,2748105,3873897,5373886,7346385, 9909345,13203156,17393702,22675681,29276201, 37458663,47526942,59829877,74766081,92789082] |