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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 42 |
| 4 | 254 |
| 5 | 762 |
| 6 | 3822 |
| 7 | 10922 |
| 8 | 65534 |
| 9 | 196602 |
| 10 | 983022 |
| 11 | 2817962 |
| 12 | 16711422 |
| 13 | 50002682 |
| 14 | 250539758 |
| 15 | 715827882 |
| 16 | 4294967294 |
| 17 | 12884901882 |
| 18 | 64424509422 |
| 19 | 184683593642 |
| 20 | 1095216660222 |
| 21 | 3277060045562 |
| 22 | 16419659968238 |
| 23 | 46913927752362 |
| 24 | 281470681677822 |
| 25 | 844403454967802 |
[1,2,14,42,254,762,3822,10922,65534,196602,983022, 2817962,16711422,50002682,250539758,715827882, 4294967294,12884901882,64424509422,184683593642, 1095216660222,3277060045562,16419659968238, 46913927752362,281470681677822,844403454967802] |