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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 279936 |
| 2 | 19487171 |
| 3 | 268435456 |
| 4 | 1801088541 |
| 5 | 8031810176 |
| 6 | 27512614111 |
| 7 | 78364164096 |
| 8 | 194754273881 |
| 9 | 435817657216 |
| 10 | 897410677851 |
| 11 | 1727094849536 |
| 12 | 3142742836021 |
| 13 | 5455160701056 |
| 14 | 9095120158391 |
| 15 | 14645194571776 |
| 16 | 22876792454961 |
| 17 | 34792782221696 |
| 18 | 51676101935731 |
| 19 | 75144747810816 |
| 20 | 107213535210701 |
[1,279936,19487171,268435456,1801088541, 8031810176,27512614111,78364164096,194754273881, 435817657216,897410677851,1727094849536, 3142742836021,5455160701056,9095120158391, 14645194571776,22876792454961,34792782221696, 51676101935731,75144747810816,107213535210701] |