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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 15 |
| 4 | 42 |
| 5 | 176 |
| 6 | 299 |
| 7 | 697 |
| 8 | 988 |
| 9 | 1794 |
| 10 | 3683 |
| 11 | 4526 |
| 12 | 7807 |
| 13 | 10701 |
| 14 | 12384 |
| 15 | 16262 |
| 16 | 23479 |
| 17 | 32568 |
| 18 | 36051 |
| 19 | 47972 |
| 20 | 57226 |
| 21 | 62269 |
| 22 | 79158 |
| 23 | 91964 |
| 24 | 113653 |
| 25 | 147537 |
| 26 | 166751 |
| 27 | 176954 |
| 28 | 198592 |
| 29 | 210043 |
| 30 | 234249 |
| 31 | 333502 |
| 32 | 366276 |
| 33 | 419357 |
| 34 | 438128 |
| 35 | 540423 |
| 36 | 562626 |
| 37 | 632867 |
[2,4,15,42,176,299,697,988,1794,3683,4526,7807, 10701,12384,16262,23479,32568,36051,47972,57226, 62269,79158,91964,113653,147537,166751,176954, 198592,210043,234249,333502,366276,419357,438128, 540423,562626,632867] |