The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 9 |
| 6 | 20 |
| 7 | 31 |
| 8 | 70 |
| 9 | 114 |
| 10 | 243 |
| 11 | 415 |
| 12 | 961 |
| 13 | 1603 |
| 14 | 3564 |
| 15 | 6559 |
| 16 | 14913 |
| 17 | 26630 |
| 18 | 60037 |
| 19 | 110160 |
| 20 | 248859 |
| 21 | 458445 |
| 22 | 1001190 |
| 23 | 1882350 |
| 24 | 4220358 |
| 25 | 7765303 |
| 26 | 16822107 |
| 27 | 32307240 |
| 28 | 70081784 |
| 29 | 133716083 |
| 30 | 291788153 |
| 31 | 561823990 |
| 32 | 1230204229 |
| 33 | 2396185727 |
| 34 | 5176454708 |
| 35 | 10220127290 |
[1,2,3,6,9,20,31,70,114,243,415,961,1603,3564, 6559,14913,26630,60037,110160,248859,458445, 1001190,1882350,4220358,7765303,16822107,32307240, 70081784,133716083,291788153,561823990,1230204229, 2396185727,5176454708,10220127290] |