The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 204 |
| 3 | 444 |
| 4 | 564 |
| 5 | 744 |
| 6 | 1160 |
| 7 | 1284 |
| 8 | 1416 |
| 9 | 1644 |
| 10 | 1704 |
| 11 | 1812 |
| 12 | 2124 |
| 13 | 2172 |
| 14 | 2480 |
| 15 | 2604 |
| 16 | 2844 |
| 17 | 2892 |
| 18 | 2964 |
| 19 | 3084 |
| 20 | 3156 |
| 21 | 3192 |
| 22 | 3320 |
| 23 | 3324 |
| 24 | 3396 |
| 25 | 3492 |
| 26 | 3560 |
| 27 | 3576 |
| 28 | 3756 |
| 29 | 3972 |
| 30 | 4164 |
| 31 | 4404 |
| 32 | 4476 |
| 33 | 4520 |
| 34 | 4572 |
| 35 | 4740 |
| 36 | 4764 |
| 37 | 5004 |
[20,204,444,564,744,1160,1284,1416,1644,1704,1812, 2124,2172,2480,2604,2844,2892,2964,3084,3156,3192, 3320,3324,3396,3492,3560,3576,3756,3972,4164,4404, 4476,4520,4572,4740,4764,5004] |