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A006737 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 68 |
| 3 | 442 |
| 4 | 2218 |
| 5 | 9528 |
| 6 | 36834 |
| 7 | 131856 |
| 8 | 445000 |
| 9 | 1433294 |
| 10 | 4444006 |
| 11 | 13349510 |
| 12 | 39041224 |
| 13 | 111583236 |
| 14 | 312618368 |
| 15 | 860662498 |
| 16 | 2333112020 |
| 17 | 6238124024 |
| 18 | 16474149036 |
| 19 | 43023953304 |
| 20 | 111230237224 |
| 21 | 284926172100 |
| 22 | 723731637254 |
[0,6,68,442,2218,9528,36834,131856,445000,1433294, 4444006,13349510,39041224,111583236,312618368, 860662498,2333112020,6238124024,16474149036, 43023953304,111230237224,284926172100, 723731637254] |