The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 18 |
| 3 | 38 |
| 4 | 72 |
| 5 | 138 |
| 6 | 254 |
| 7 | 432 |
| 8 | 708 |
| 9 | 1154 |
| 10 | 1836 |
| 11 | 2826 |
| 12 | 4288 |
| 13 | 6456 |
| 14 | 9552 |
| 15 | 13902 |
| 16 | 20070 |
| 17 | 28722 |
| 18 | 40614 |
| 19 | 56916 |
| 20 | 79242 |
| 21 | 109448 |
| 22 | 149988 |
| 23 | 204318 |
| 24 | 276672 |
| 25 | 372288 |
| 26 | 498264 |
| 27 | 663602 |
| 28 | 879252 |
| 29 | 1159470 |
| 30 | 1522564 |
| 31 | 1990788 |
| 32 | 2592162 |
| 33 | 3362638 |
| 34 | 4346244 |
| 35 | 5597100 |
| 36 | 7183792 |
| 37 | 9191004 |
[1,6,18,38,72,138,254,432,708,1154,1836,2826,4288, 6456,9552,13902,20070,28722,40614,56916,79242, 109448,149988,204318,276672,372288,498264,663602, 879252,1159470,1522564,1990788,2592162,3362638, 4346244,5597100,7183792,9191004] |