The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 56 |
| 1 | 84 |
| 2 | 156 |
| 3 | 354 |
| 4 | 936 |
| 5 | 2754 |
| 6 | 8736 |
| 7 | 29274 |
| 8 | 102216 |
| 9 | 368274 |
| 10 | 1359216 |
| 11 | 5110794 |
| 12 | 19495896 |
| 13 | 75203394 |
| 14 | 292596096 |
| 15 | 1145977914 |
| 16 | 4511183976 |
| 17 | 17827536114 |
| 18 | 70660511376 |
| 19 | 280697078634 |
| 20 | 1116961278456 |
| 21 | 4450379734434 |
| 22 | 17749154257056 |
| 23 | 70839585900954 |
| 24 | 282887376051336 |
| 25 | 1130136853206354 |
| 26 | 4516309963145136 |
| 27 | 18052528510172874 |
| 28 | 72171982026734616 |
[56,84,156,354,936,2754,8736,29274,102216,368274, 1359216,5110794,19495896,75203394,292596096, 1145977914,4511183976,17827536114,70660511376, 280697078634,1116961278456,4450379734434, 17749154257056,70839585900954,282887376051336, 1130136853206354,4516309963145136, 18052528510172874,72171982026734616] |