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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 28 |
| 3 | 97 |
| 4 | 480 |
| 5 | 1657 |
| 6 | 8697 |
| 7 | 31654 |
| 8 | 92204 |
| 9 | 397955 |
| 10 | 1440202 |
| 11 | 5015494 |
| 12 | 20114505 |
| 13 | 70074714 |
| 14 | 258768285 |
| 15 | 999131434 |
| 16 | 3471187281 |
| 17 | 13084431710 |
| 18 | 49495338616 |
| 19 | 176036491899 |
| 20 | 662243630484 |
| 21 | 2450968267032 |
| 22 | 8911921597230 |
| 23 | 33375847400152 |
[7,28,97,480,1657,8697,31654,92204,397955,1440202, 5015494,20114505,70074714,258768285,999131434, 3471187281,13084431710,49495338616,176036491899, 662243630484,2450968267032,8911921597230, 33375847400152] |