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| n | a(n) |
|---|---|
| 1 | 888 |
| 2 | 3852 |
| 3 | 16212 |
| 4 | 85064 |
| 5 | 429108 |
| 6 | 2380742 |
| 7 | 12891190 |
| 8 | 73033832 |
| 9 | 407662600 |
| 10 | 2333365070 |
| 11 | 13220203386 |
| 12 | 76129805278 |
| 13 | 435052159304 |
| 14 | 2515577967734 |
| 15 | 14458394715076 |
| 16 | 83858270702244 |
| 17 | 484060453024772 |
| 18 | 2814490812097076 |
[888,3852,16212,85064,429108,2380742,12891190, 73033832,407662600,2333365070,13220203386, 76129805278,435052159304,2515577967734, 14458394715076,83858270702244,484060453024772, 2814490812097076] |