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A180875 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 55 |
| 4 | 355 |
| 5 | 2807 |
| 6 | 26259 |
| 7 | 283623 |
| 8 | 3473315 |
| 9 | 47552791 |
| 10 | 719718067 |
| 11 | 11932268231 |
| 12 | 215053088835 |
| 13 | 4186305575415 |
| 14 | 87534887434835 |
| 15 | 1956680617267879 |
| 16 | 46561960552921315 |
| 17 | 1175204650272267479 |
| 18 | 31357650670190565363 |
| 19 | 881958890078887314567 |
| 20 | 26078499305918584929155 |
| 21 | 808742391638178302137783 |
[1,3,11,55,355,2807,26259,283623,3473315,47552791, 719718067,11932268231,215053088835,4186305575415, 87534887434835,1956680617267879,46561960552921315, 1175204650272267479,31357650670190565363, 881958890078887314567,26078499305918584929155, 808742391638178302137783] |