The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 15 |
| 3 | 57 |
| 4 | 188 |
| 5 | 544 |
| 6 | 1380 |
| 7 | 3172 |
| 8 | 6687 |
| 9 | 13163 |
| 10 | 24435 |
| 11 | 43195 |
| 12 | 73194 |
| 13 | 119616 |
| 14 | 189346 |
| 15 | 291486 |
| 16 | 437723 |
| 17 | 642977 |
| 18 | 925889 |
| 19 | 1309647 |
| 20 | 1822576 |
| 21 | 2499166 |
| 22 | 3380806 |
| 23 | 4517000 |
| 24 | 5966265 |
| 25 | 7797585 |
| 26 | 10091447 |
| 27 | 12941561 |
| 28 | 16456084 |
| 29 | 20759580 |
| 30 | 25994452 |
| 31 | 32323204 |
[5,15,57,188,544,1380,3172,6687,13163,24435,43195, 73194,119616,189346,291486,437723,642977,925889, 1309647,1822576,2499166,3380806,4517000,5966265, 7797585,10091447,12941561,16456084,20759580, 25994452,32323204] |