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A110154 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 20 |
| 3 | 84 |
| 4 | 380 |
| 5 | 1540 |
| 6 | 6796 |
| 7 | 27380 |
| 8 | 117020 |
| 9 | 476260 |
| 10 | 2002220 |
| 11 | 8063316 |
| 12 | 33957180 |
| 13 | 136489156 |
| 14 | 566211660 |
| 15 | 2290272692 |
| 16 | 9463603036 |
| 17 | 38042178340 |
| 18 | 157211980652 |
| 19 | 631321594900 |
| 20 | 2594532576636 |
| 21 | 10457495255940 |
| 22 | 42791736547980 |
[1,4,20,84,380,1540,6796,27380,117020,476260, 2002220,8063316,33957180,136489156,566211660, 2290272692,9463603036,38042178340,157211980652, 631321594900,2594532576636,10457495255940, 42791736547980] |