The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 26 |
| 2 | 238 |
| 3 | 1176 |
| 4 | 4200 |
| 5 | 12180 |
| 6 | 30492 |
| 7 | 68376 |
| 8 | 140712 |
| 9 | 270270 |
| 10 | 490490 |
| 11 | 848848 |
| 12 | 1410864 |
| 13 | 2264808 |
| 14 | 3527160 |
| 15 | 5348880 |
| 16 | 7922544 |
| 17 | 11490402 |
| 18 | 16353414 |
| 19 | 22881320 |
| 20 | 31523800 |
| 21 | 42822780 |
| 22 | 57425940 |
| 23 | 76101480 |
| 24 | 99754200 |
| 25 | 129442950 |
| 26 | 166399506 |
| 27 | 212048928 |
| 28 | 268031456 |
| 29 | 336226000 |
[0,26,238,1176,4200,12180,30492,68376,140712, 270270,490490,848848,1410864,2264808,3527160, 5348880,7922544,11490402,16353414,22881320, 31523800,42822780,57425940,76101480,99754200, 129442950,166399506,212048928,268031456,336226000] |