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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 25 |
| 3 | 25 |
| 4 | 45 |
| 5 | 79 |
| 6 | 146 |
| 7 | 286 |
| 8 | 563 |
| 9 | 1114 |
| 10 | 2222 |
| 11 | 4435 |
| 12 | 8858 |
| 13 | 17710 |
| 14 | 35411 |
| 15 | 70810 |
| 16 | 141614 |
| 17 | 283219 |
| 18 | 566426 |
| 19 | 1132846 |
| 20 | 2265683 |
| 21 | 4531354 |
| 22 | 9062702 |
| 23 | 18125395 |
| 24 | 36250778 |
| 25 | 72501550 |
| 26 | 145003091 |
| 27 | 290006170 |
| 28 | 580012334 |
| 29 | 1160024659 |
| 30 | 2320049306 |
| 31 | 4640098606 |
[4,25,25,45,79,146,286,563,1114,2222,4435,8858, 17710,35411,70810,141614,283219,566426,1132846, 2265683,4531354,9062702,18125395,36250778, 72501550,145003091,290006170,580012334,1160024659, 2320049306,4640098606] |