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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 25 |
| 3 | 137 |
| 4 | 766 |
| 5 | 4379 |
| 6 | 25355 |
| 7 | 148273 |
| 8 | 873574 |
| 9 | 5177450 |
| 10 | 30833342 |
| 11 | 184355207 |
| 12 | 1105977887 |
| 13 | 6653964847 |
| 14 | 40131748300 |
| 15 | 242567280865 |
| 16 | 1468928473132 |
| 17 | 8910461020730 |
| 18 | 54131814523902 |
| 19 | 329299899410062 |
| 20 | 2005674943792559 |
[1,5,25,137,766,4379,25355,148273,873574,5177450, 30833342,184355207,1105977887,6653964847, 40131748300,242567280865,1468928473132, 8910461020730,54131814523902,329299899410062, 2005674943792559] |