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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 94 |
| 5 | 361 |
| 6 | 1576 |
| 7 | 6530 |
| 8 | 29516 |
| 9 | 127878 |
| 10 | 590559 |
| 11 | 2634070 |
| 12 | 12341217 |
| 13 | 56173161 |
| 14 | 265904947 |
| 15 | 1228423217 |
| 16 | 5859698492 |
| 17 | 27377752283 |
| 18 | 131368809993 |
| 19 | 619221519393 |
| 20 | 2985201395808 |
| 21 | 14170716751393 |
| 22 | 68574870560711 |
| 23 | 327401546886254 |
| 24 | 1589315428282046 |
| 25 | 7624188636895595 |
| 26 | 37107171688761827 |
| 27 | 178721337271863623 |
[1,2,7,23,94,361,1576,6530,29516,127878,590559, 2634070,12341217,56173161,265904947,1228423217, 5859698492,27377752283,131368809993,619221519393, 2985201395808,14170716751393,68574870560711, 327401546886254,1589315428282046,7624188636895595, 37107171688761827,178721337271863623] |