The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 30 |
| 6 | 96 |
| 7 | 313 |
| 8 | 1038 |
| 9 | 3512 |
| 10 | 12100 |
| 11 | 42286 |
| 12 | 149440 |
| 13 | 533076 |
| 14 | 1917000 |
| 15 | 6942660 |
| 16 | 25300034 |
| 17 | 92701746 |
| 18 | 341319648 |
| 19 | 1262176462 |
| 20 | 4685724500 |
| 21 | 17457027376 |
| 22 | 65247128392 |
| 23 | 244584468174 |
| 24 | 919319871360 |
| 25 | 3464027857900 |
| 26 | 13082491517336 |
| 27 | 49513139090512 |
| 28 | 187761168576904 |
| 29 | 713325243149880 |
| 30 | 2714644395230080 |
| 31 | 10347465825694361 |
| 32 | 39500936075084958 |
| 33 | 151005816167189208 |
| 34 | 578038682649831252 |
| 35 | 2215461387843704450 |
| 36 | 8501300598574467776 |
| 37 | 32658238309503587964 |
[1,2,4,10,30,96,313,1038,3512,12100,42286,149440, 533076,1917000,6942660,25300034,92701746, 341319648,1262176462,4685724500,17457027376, 65247128392,244584468174,919319871360, 3464027857900,13082491517336,49513139090512, 187761168576904,713325243149880,2714644395230080, 10347465825694361,39500936075084958, 151005816167189208,578038682649831252, 2215461387843704450,8501300598574467776, 32658238309503587964] |