The OEIS is supported by the many generous donors to the OEIS Foundation.
A302070 as a simple table
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 32 |
| 3 | 148 |
| 4 | 748 |
| 5 | 3657 |
| 6 | 18108 |
| 7 | 89658 |
| 8 | 444359 |
| 9 | 2202106 |
| 10 | 10912859 |
| 11 | 54080195 |
| 12 | 268002332 |
| 13 | 1328125172 |
| 14 | 6581720890 |
| 15 | 32616691234 |
| 16 | 161636836900 |
| 17 | 801015249307 |
| 18 | 3969549529089 |
| 19 | 19671689743540 |
| 20 | 97485967746453 |
| 21 | 483106130247259 |
[4,32,148,748,3657,18108,89658,444359,2202106, 10912859,54080195,268002332,1328125172,6581720890, 32616691234,161636836900,801015249307, 3969549529089,19671689743540,97485967746453, 483106130247259] |