The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 56 |
| 5 | 80 |
| 6 | 203 |
| 7 | 572 |
| 8 | 847 |
| 9 | 1402 |
| 10 | 93496 |
| 11 | 128180 |
| 12 | 431060 |
| 13 | 467852 |
| 14 | 1465676 |
| 15 | 7742920 |
| 16 | 8727388 |
| 17 | 8923840 |
| 18 | 9582707 |
| 19 | 18245944 |
| 20 | 18304588 |
| 21 | 25154692 |
| 22 | 27262924 |
| 23 | 115404434 |
| 24 | 209060644 |
| 25 | 763786258 |
| 26 | 860973806 |
| 27 | 2042328148 |
| 28 | 4719261289 |
| 29 | 5236838932 |
| 30 | 18202403140 |
| 31 | 42897493894 |
| 32 | 77310551669 |
[0,1,4,56,80,203,572,847,1402,93496,128180,431060, 467852,1465676,7742920,8727388,8923840,9582707, 18245944,18304588,25154692,27262924,115404434, 209060644,763786258,860973806,2042328148, 4719261289,5236838932,18202403140,42897493894, 77310551669] |