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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 20 |
| 3 | 52 |
| 4 | 116 |
| 5 | 244 |
| 6 | 500 |
| 7 | 1012 |
| 8 | 2036 |
| 9 | 4084 |
| 10 | 8180 |
| 11 | 16372 |
| 12 | 32756 |
| 13 | 65524 |
| 14 | 131060 |
| 15 | 262132 |
| 16 | 524276 |
| 17 | 1048564 |
| 18 | 2097140 |
| 19 | 4194292 |
| 20 | 8388596 |
| 21 | 16777204 |
| 22 | 33554420 |
| 23 | 67108852 |
| 24 | 134217716 |
| 25 | 268435444 |
| 26 | 536870900 |
| 27 | 1073741812 |
| 28 | 2147483636 |
[1,5,20,52,116,244,500,1012,2036,4084,8180,16372, 32756,65524,131060,262132,524276,1048564,2097140, 4194292,8388596,16777204,33554420,67108852, 134217716,268435444,536870900,1073741812, 2147483636] |