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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 56 |
| 4 | 219 |
| 5 | 796 |
| 6 | 3079 |
| 7 | 11614 |
| 8 | 44076 |
| 9 | 167210 |
| 10 | 635033 |
| 11 | 2409994 |
| 12 | 9147953 |
| 13 | 34722997 |
| 14 | 131802284 |
| 15 | 500289672 |
| 16 | 1898992405 |
| 17 | 7208159665 |
| 18 | 27360619128 |
| 19 | 103854959332 |
| 20 | 394210908018 |
| 21 | 1496339057640 |
| 22 | 5679778471327 |
| 23 | 21559206754217 |
| 24 | 81834071700364 |
[1,18,56,219,796,3079,11614,44076,167210,635033, 2409994,9147953,34722997,131802284,500289672, 1898992405,7208159665,27360619128,103854959332, 394210908018,1496339057640,5679778471327, 21559206754217,81834071700364] |