The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 14 |
| 7 | 31 |
| 8 | 74 |
| 9 | 176 |
| 10 | 425 |
| 11 | 1055 |
| 12 | 2637 |
| 13 | 6671 |
| 14 | 16995 |
| 15 | 43507 |
| 16 | 112102 |
| 17 | 290347 |
| 18 | 755836 |
| 19 | 1976717 |
| 20 | 5189664 |
| 21 | 13673314 |
| 22 | 36139543 |
| 23 | 95795807 |
| 24 | 254610593 |
| 25 | 678385919 |
| 26 | 1811625931 |
| 27 | 4848177910 |
| 28 | 12999914523 |
| 29 | 34921821516 |
| 30 | 93971264941 |
| 31 | 253272232362 |
| 32 | 683646029385 |
| 33 | 1847935127768 |
| 34 | 5001703392561 |
| 35 | 13554768152442 |
| 36 | 36777239050602 |
| 37 | 99896764310264 |
| 38 | 271633640605450 |
| 39 | 739353335433377 |
| 40 | 2014350935223715 |
| 41 | 5493039157088226 |
| 42 | 14992221809540249 |
[1,1,1,2,3,6,14,31,74,176,425,1055,2637,6671, 16995,43507,112102,290347,755836,1976717,5189664, 13673314,36139543,95795807,254610593,678385919, 1811625931,4848177910,12999914523,34921821516, 93971264941,253272232362,683646029385, 1847935127768,5001703392561,13554768152442, 36777239050602,99896764310264,271633640605450, 739353335433377,2014350935223715,5493039157088226, 14992221809540249] |