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A245505 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 19 |
| 4 | 116 |
| 5 | 901 |
| 6 | 8422 |
| 7 | 89755 |
| 8 | 1066088 |
| 9 | 14154409 |
| 10 | 212952266 |
| 11 | 3646226959 |
| 12 | 69912304156 |
| 13 | 1460516349709 |
| 14 | 32480282189006 |
| 15 | 759186766079011 |
| 16 | 18569220500830928 |
| 17 | 475114325555073745 |
| 18 | 12719547174925542034 |
| 19 | 356098625214192355735 |
| 20 | 10413932958067814029316 |
[1,1,4,19,116,901,8422,89755,1066088,14154409, 212952266,3646226959,69912304156,1460516349709, 32480282189006,759186766079011,18569220500830928, 475114325555073745,12719547174925542034, 356098625214192355735,10413932958067814029316] |