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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 37 |
| 5 | 119 |
| 6 | 397 |
| 7 | 1364 |
| 8 | 4690 |
| 9 | 16567 |
| 10 | 60099 |
| 11 | 221639 |
| 12 | 824168 |
| 13 | 3076794 |
| 14 | 11626300 |
| 15 | 44410611 |
| 16 | 171024300 |
| 17 | 661133266 |
| 18 | 2566409626 |
| 19 | 10027307231 |
| 20 | 39409100079 |
| 21 | 155553063846 |
| 22 | 615628813008 |
| 23 | 2444688640372 |
| 24 | 9747085883927 |
| 25 | 39001498700419 |
| 26 | 156466842555659 |
| 27 | 629063961684359 |
| 28 | 2535651643941736 |
[1,2,5,13,37,119,397,1364,4690,16567,60099,221639, 824168,3076794,11626300,44410611,171024300, 661133266,2566409626,10027307231,39409100079, 155553063846,615628813008,2444688640372, 9747085883927,39001498700419,156466842555659, 629063961684359,2535651643941736] |