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A292437 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 120 |
| 4 | 1288 |
| 5 | 15046 |
| 6 | 185658 |
| 7 | 2380720 |
| 8 | 31411376 |
| 9 | 423660504 |
| 10 | 5814905977 |
| 11 | 80956085304 |
| 12 | 1140478875656 |
| 13 | 16227516683124 |
| 14 | 232870988052180 |
| 15 | 3366482778363616 |
| 16 | 48981220255732960 |
| 17 | 716707681487535144 |
| 18 | 10539913681632290532 |
| 19 | 155697664218428455520 |
| 20 | 2309297999296926348448 |
[1,2,13,120,1288,15046,185658,2380720,31411376, 423660504,5814905977,80956085304,1140478875656, 16227516683124,232870988052180,3366482778363616, 48981220255732960,716707681487535144, 10539913681632290532,155697664218428455520, 2309297999296926348448] |