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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 26 |
| 5 | 57 |
| 6 | 123 |
| 7 | 264 |
| 8 | 568 |
| 9 | 1224 |
| 10 | 2637 |
| 11 | 5679 |
| 12 | 12230 |
| 13 | 26340 |
| 14 | 56730 |
| 15 | 122181 |
| 16 | 263143 |
| 17 | 566736 |
| 18 | 1220592 |
| 19 | 2628816 |
| 20 | 5661737 |
| 21 | 12193803 |
| 22 | 26262054 |
| 23 | 56561148 |
| 24 | 121816954 |
| 25 | 262359777 |
| 26 | 565049859 |
| 27 | 1216959960 |
| 28 | 2620992680 |
| 29 | 5644887960 |
| 30 | 12157515861 |
| 31 | 26183901783 |
| 32 | 56392828966 |
[1,3,6,12,26,57,123,264,568,1224,2637,5679,12230, 26340,56730,122181,263143,566736,1220592,2628816, 5661737,12193803,26262054,56561148,121816954, 262359777,565049859,1216959960,2620992680, 5644887960,12157515861,26183901783,56392828966] |