The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 0 |
| 6 | 1 |
| 7 | 6 |
| 8 | 0 |
| 9 | 6 |
| 10 | 6 |
| 11 | 24 |
| 12 | 15 |
| 13 | 26 |
| 14 | 48 |
| 15 | 56 |
| 16 | 240 |
| 17 | 60 |
| 18 | 303 |
| 19 | 504 |
| 20 | 780 |
| 21 | 1002 |
| 22 | 1776 |
| 23 | 3246 |
| 24 | 3601 |
| 25 | 7826 |
| 26 | 7500 |
| 27 | 18980 |
| 28 | 26874 |
| 29 | 38130 |
| 30 | 56196 |
| 31 | 99360 |
| 32 | 153636 |
| 33 | 210084 |
| 34 | 390348 |
| 35 | 486420 |
| 36 | 900428 |
| 37 | 1310118 |
| 38 | 2064612 |
| 39 | 3073008 |
| 40 | 4825138 |
| 41 | 7558008 |
| 42 | 11428162 |
| 43 | 18596886 |
| 44 | 26006031 |
| 45 | 43625940 |
| 46 | 65162736 |
| 47 | 100027728 |
| 48 | 152897710 |
| 49 | 242895050 |
[0,1,1,0,2,0,1,6,0,6,6,24,15,26,48,56,240,60,303, 504,780,1002,1776,3246,3601,7826,7500,18980,26874, 38130,56196,99360,153636,210084,390348,486420, 900428,1310118,2064612,3073008,4825138,7558008, 11428162,18596886,26006031,43625940,65162736, 100027728,152897710,242895050] |