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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 63 |
| 3 | 730 |
| 4 | 4031 |
| 5 | 15626 |
| 6 | 45990 |
| 7 | 117650 |
| 8 | 257983 |
| 9 | 532171 |
| 10 | 984438 |
| 11 | 1771562 |
| 12 | 2942630 |
| 13 | 4826810 |
| 14 | 7411950 |
| 15 | 11406980 |
| 16 | 16510911 |
| 17 | 24137570 |
| 18 | 33526773 |
| 19 | 47045882 |
| 20 | 62988406 |
| 21 | 85884500 |
| 22 | 111608406 |
| 23 | 148035890 |
| 24 | 188327590 |
| 25 | 244156251 |
| 26 | 304089030 |
| 27 | 387952660 |
| 28 | 474247150 |
| 29 | 594823322 |
[1,63,730,4031,15626,45990,117650,257983,532171, 984438,1771562,2942630,4826810,7411950,11406980, 16510911,24137570,33526773,47045882,62988406, 85884500,111608406,148035890,188327590,244156251, 304089030,387952660,474247150,594823322] |