The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 106 |
| 2 | 356 |
| 3 | 1168 |
| 4 | 3886 |
| 5 | 12890 |
| 6 | 42744 |
| 7 | 141688 |
| 8 | 469726 |
| 9 | 1557320 |
| 10 | 5163158 |
| 11 | 17117854 |
| 12 | 56752072 |
| 13 | 188154290 |
| 14 | 623802050 |
| 15 | 2068138180 |
| 16 | 6856654898 |
| 17 | 22732385492 |
| 18 | 75366392740 |
| 19 | 249867889178 |
| 20 | 828405870894 |
| 21 | 2746476505360 |
| 22 | 9105600837300 |
[106,356,1168,3886,12890,42744,141688,469726, 1557320,5163158,17117854,56752072,188154290, 623802050,2068138180,6856654898,22732385492, 75366392740,249867889178,828405870894, 2746476505360,9105600837300] |