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A151371 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 16 |
| 5 | 64 |
| 6 | 266 |
| 7 | 1210 |
| 8 | 5630 |
| 9 | 27338 |
| 10 | 136182 |
| 11 | 695270 |
| 12 | 3622134 |
| 13 | 19202912 |
| 14 | 103375978 |
| 15 | 564014502 |
| 16 | 3114100008 |
| 17 | 17377324802 |
| 18 | 97897946434 |
| 19 | 556290574936 |
| 20 | 3185821992528 |
| 21 | 18375238184570 |
| 22 | 106677854854822 |
| 23 | 623039452424644 |
| 24 | 3658928077976048 |
| 25 | 21597785683494184 |
| 26 | 128091748188993146 |
| 27 | 763037745974345554 |
[1,0,2,4,16,64,266,1210,5630,27338,136182,695270, 3622134,19202912,103375978,564014502,3114100008, 17377324802,97897946434,556290574936, 3185821992528,18375238184570,106677854854822, 623039452424644,3658928077976048, 21597785683494184,128091748188993146, 763037745974345554] |