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A321407 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 13 |
| 6 | 47 |
| 7 | 111 |
| 8 | 367 |
| 9 | 1057 |
| 10 | 3474 |
| 11 | 11116 |
| 12 | 38106 |
| 13 | 131235 |
| 14 | 470882 |
| 15 | 1720959 |
| 16 | 6472129 |
| 17 | 24860957 |
| 18 | 97779665 |
| 19 | 392642763 |
| 20 | 1610045000 |
| 21 | 6732768139 |
| 22 | 28699327441 |
| 23 | 124600601174 |
| 24 | 550684155992 |
| 25 | 2476019025827 |
| 26 | 11320106871951 |
| 27 | 52598300581495 |
| 28 | 248265707440448 |
| 29 | 1189855827112636 |
| 30 | 5787965846277749 |
[1,0,1,2,7,13,47,111,367,1057,3474,11116,38106, 131235,470882,1720959,6472129,24860957,97779665, 392642763,1610045000,6732768139,28699327441, 124600601174,550684155992,2476019025827, 11320106871951,52598300581495,248265707440448, 1189855827112636,5787965846277749] |