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A304187 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 21 |
| 3 | 86 |
| 4 | 606 |
| 5 | 6756 |
| 6 | 102316 |
| 7 | 1931046 |
| 8 | 43250376 |
| 9 | 1114876536 |
| 10 | 32394654066 |
| 11 | 1045240099026 |
| 12 | 37027935179016 |
| 13 | 1427410628324856 |
| 14 | 59449956448178106 |
| 15 | 2659215814433980056 |
| 16 | 127108810653344820456 |
| 17 | 6464722863550156435146 |
| 18 | 348541208165221134718986 |
| 19 | 19854709880058367829287716 |
| 20 | 1191556960000156185148449636 |
[1,6,21,86,606,6756,102316,1931046,43250376, 1114876536,32394654066,1045240099026, 37027935179016,1427410628324856,59449956448178106, 2659215814433980056,127108810653344820456, 6464722863550156435146,348541208165221134718986, 19854709880058367829287716, 1191556960000156185148449636] |