The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 18 |
| 2 | 46 |
| 3 | 110 |
| 4 | 257 |
| 5 | 596 |
| 6 | 1376 |
| 7 | 3173 |
| 8 | 7310 |
| 9 | 16838 |
| 10 | 38777 |
| 11 | 89300 |
| 12 | 205640 |
| 13 | 473549 |
| 14 | 1090478 |
| 15 | 2511134 |
| 16 | 5782577 |
| 17 | 13315988 |
| 18 | 30663728 |
| 19 | 70611701 |
| 20 | 162602894 |
| 21 | 374438006 |
| 22 | 862246697 |
| 23 | 1985560724 |
| 24 | 4572300824 |
| 25 | 10528983005 |
| 26 | 24245885486 |
| 27 | 55832834510 |
[18,46,110,257,596,1376,3173,7310,16838,38777, 89300,205640,473549,1090478,2511134,5782577, 13315988,30663728,70611701,162602894,374438006, 862246697,1985560724,4572300824,10528983005, 24245885486,55832834510] |