The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 25 |
| 6 | 46 |
| 7 | 163 |
| 8 | 301 |
| 9 | 1066 |
| 10 | 1969 |
| 11 | 6973 |
| 12 | 12880 |
| 13 | 45613 |
| 14 | 84253 |
| 15 | 298372 |
| 16 | 551131 |
| 17 | 1951765 |
| 18 | 3605158 |
| 19 | 12767239 |
| 20 | 23582713 |
| 21 | 83515378 |
| 22 | 154263517 |
| 23 | 546305929 |
| 24 | 1009096480 |
| 25 | 3573595369 |
| 26 | 6600884809 |
| 27 | 23376249796 |
| 28 | 43178904223 |
| 29 | 152912962465 |
| 30 | 282449675134 |
| 31 | 1000261987867 |
| 32 | 1847611013269 |
| 33 | 6543095027674 |
[0,1,1,4,7,25,46,163,301,1066,1969,6973,12880, 45613,84253,298372,551131,1951765,3605158, 12767239,23582713,83515378,154263517,546305929, 1009096480,3573595369,6600884809,23376249796, 43178904223,152912962465,282449675134, 1000261987867,1847611013269,6543095027674] |