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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 25 |
| 3 | 95 |
| 4 | 315 |
| 5 | 895 |
| 6 | 2535 |
| 7 | 7280 |
| 8 | 21562 |
| 9 | 64924 |
| 10 | 201975 |
| 11 | 640915 |
| 12 | 2095019 |
| 13 | 6978713 |
| 14 | 23859310 |
| 15 | 82982260 |
| 16 | 295202798 |
| 17 | 1066467105 |
| 18 | 3928481530 |
| 19 | 14672457970 |
| 20 | 55722273963 |
| 21 | 214254166369 |
| 22 | 835669136725 |
| 23 | 3295598362466 |
| 24 | 13156401722237 |
| 25 | 53038076210255 |
| 26 | 216053087821059 |
[1,5,25,95,315,895,2535,7280,21562,64924,201975, 640915,2095019,6978713,23859310,82982260, 295202798,1066467105,3928481530,14672457970, 55722273963,214254166369,835669136725, 3295598362466,13156401722237,53038076210255, 216053087821059] |