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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 35 |
| 3 | 154 |
| 4 | 632 |
| 5 | 2487 |
| 6 | 9529 |
| 7 | 35875 |
| 8 | 133471 |
| 9 | 492538 |
| 10 | 1807268 |
| 11 | 6604891 |
| 12 | 24069905 |
| 13 | 87539199 |
| 14 | 317907067 |
| 15 | 1153307002 |
| 16 | 4180842064 |
| 17 | 15147734815 |
| 18 | 54860799881 |
| 19 | 198634274203 |
| 20 | 719047882103 |
| 21 | 2602540622106 |
| 22 | 9418700937340 |
| 23 | 34084040705539 |
| 24 | 123335178991777 |
| 25 | 446277892754167 |
| 26 | 1614771692630099 |
[1,7,35,154,632,2487,9529,35875,133471,492538, 1807268,6604891,24069905,87539199,317907067, 1153307002,4180842064,15147734815,54860799881, 198634274203,719047882103,2602540622106, 9418700937340,34084040705539,123335178991777, 446277892754167,1614771692630099] |