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A099919 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 10 |
| 3 | 44 |
| 4 | 188 |
| 5 | 798 |
| 6 | 3382 |
| 7 | 14328 |
| 8 | 60696 |
| 9 | 257114 |
| 10 | 1089154 |
| 11 | 4613732 |
| 12 | 19544084 |
| 13 | 82790070 |
| 14 | 350704366 |
| 15 | 1485607536 |
| 16 | 6293134512 |
| 17 | 26658145586 |
| 18 | 112925716858 |
| 19 | 478361013020 |
| 20 | 2026369768940 |
| 21 | 8583840088782 |
| 22 | 36361730124070 |
| 23 | 154030760585064 |
| 24 | 652484772464328 |
| 25 | 2763969850442378 |
[0,2,10,44,188,798,3382,14328,60696,257114, 1089154,4613732,19544084,82790070,350704366, 1485607536,6293134512,26658145586,112925716858, 478361013020,2026369768940,8583840088782, 36361730124070,154030760585064,652484772464328, 2763969850442378] |