The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 33 |
| 6 | 81 |
| 7 | 196 |
| 8 | 470 |
| 9 | 1126 |
| 10 | 2699 |
| 11 | 6487 |
| 12 | 15633 |
| 13 | 37788 |
| 14 | 91589 |
| 15 | 222572 |
| 16 | 542145 |
| 17 | 1323446 |
| 18 | 3237074 |
| 19 | 7932108 |
| 20 | 19469151 |
| 21 | 47860083 |
| 22 | 117819348 |
| 23 | 290424126 |
| 24 | 716772644 |
| 25 | 1771035921 |
| 26 | 4380646788 |
| 27 | 10846386691 |
| 28 | 26880759090 |
| 29 | 66678169061 |
| 30 | 165534924098 |
| 31 | 411281773379 |
| 32 | 1022621256416 |
| 33 | 2544478797575 |
| 34 | 6335428289930 |
| 35 | 15784538365081 |
| 36 | 39350771601502 |
| 37 | 98158461390807 |
[1,1,2,5,13,33,81,196,470,1126,2699,6487,15633, 37788,91589,222572,542145,1323446,3237074,7932108, 19469151,47860083,117819348,290424126,716772644, 1771035921,4380646788,10846386691,26880759090, 66678169061,165534924098,411281773379, 1022621256416,2544478797575,6335428289930, 15784538365081,39350771601502,98158461390807] |