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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 12 |
| 6 | 36 |
| 7 | 112 |
| 8 | 360 |
| 9 | 1184 |
| 10 | 3969 |
| 11 | 13506 |
| 12 | 46550 |
| 13 | 162160 |
| 14 | 570076 |
| 15 | 2019864 |
| 16 | 7205654 |
| 17 | 25859788 |
| 18 | 93299268 |
| 19 | 338207096 |
| 20 | 1231194329 |
| 21 | 4499137382 |
| 22 | 16498152995 |
| 23 | 60689045230 |
| 24 | 223891151262 |
| 25 | 828156420320 |
| 26 | 3070760666368 |
| 27 | 11411884518800 |
| 28 | 42498639965025 |
| 29 | 158575098942194 |
| 30 | 592761262161240 |
| 31 | 2219513277432130 |
| 32 | 8323806778346002 |
| 33 | 31262959171040784 |
| 34 | 117582688976071889 |
| 35 | 442819400938052362 |
| 36 | 1669735077567533522 |
| 37 | 6303424784771599874 |
| 38 | 23822450122837267190 |
[1,1,2,4,12,36,112,360,1184,3969,13506,46550, 162160,570076,2019864,7205654,25859788,93299268, 338207096,1231194329,4499137382,16498152995, 60689045230,223891151262,828156420320, 3070760666368,11411884518800,42498639965025, 158575098942194,592761262161240,2219513277432130, 8323806778346002,31262959171040784, 117582688976071889,442819400938052362, 1669735077567533522,6303424784771599874, 23822450122837267190] |