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A011001 as a simple table
| n | a(n) |
|---|---|
| 48 | 1 |
| 49 | 49 |
| 50 | 1225 |
| 51 | 20825 |
| 52 | 270725 |
| 53 | 2869685 |
| 54 | 25827165 |
| 55 | 202927725 |
| 56 | 1420494075 |
| 57 | 8996462475 |
| 58 | 52179482355 |
| 59 | 279871768995 |
| 60 | 1399358844975 |
| 61 | 6566222272575 |
| 62 | 29078984349975 |
| 63 | 122131734269895 |
| 64 | 488526937079580 |
| 65 | 1867897112363100 |
| 66 | 6848956078664700 |
| 67 | 24151581961607100 |
[1,49,1225,20825,270725,2869685,25827165, 202927725,1420494075,8996462475,52179482355, 279871768995,1399358844975,6566222272575, 29078984349975,122131734269895,488526937079580, 1867897112363100,6848956078664700, 24151581961607100] |