The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 13 |
| 3 | 50 |
| 4 | 193 |
| 5 | 731 |
| 6 | 2843 |
| 7 | 10970 |
| 8 | 42213 |
| 9 | 162766 |
| 10 | 627709 |
| 11 | 2419707 |
| 12 | 9327886 |
| 13 | 35961933 |
| 14 | 138640724 |
| 15 | 534481526 |
| 16 | 2060527603 |
| 17 | 7943732911 |
| 18 | 30624562306 |
| 19 | 118063389795 |
| 20 | 455156544799 |
| 21 | 1754713724522 |
| 22 | 6764749611412 |
| 23 | 26079376227742 |
| 24 | 100540878288579 |
[3,13,50,193,731,2843,10970,42213,162766,627709, 2419707,9327886,35961933,138640724,534481526, 2060527603,7943732911,30624562306,118063389795, 455156544799,1754713724522,6764749611412, 26079376227742,100540878288579] |