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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 7 |
| 4 | 49 |
| 5 | 91 |
| 6 | 637 |
| 7 | 1729 |
| 8 | 8281 |
| 9 | 12103 |
| 10 | 53599 |
| 11 | 157339 |
| 12 | 375193 |
| 13 | 1983163 |
| 14 | 4877509 |
| 15 | 13882141 |
| 16 | 85276009 |
| 17 | 180467833 |
| 18 | 596932063 |
| 19 | 3428888827 |
| 20 | 4178524441 |
| 21 | 7760116819 |
| 22 | 29249671087 |
| 23 | 36412855843 |
| 24 | 147442219561 |
| 25 | 254889990901 |
| 26 | 473367125959 |
| 27 | 1784229936307 |
| 28 | 2439661341481 |
[0,1,7,49,91,637,1729,8281,12103,53599,157339, 375193,1983163,4877509,13882141,85276009, 180467833,596932063,3428888827,4178524441, 7760116819,29249671087,36412855843,147442219561, 254889990901,473367125959,1784229936307, 2439661341481] |