A281890 as a triangular array
| | | | | | | | | 1 |
| | | | | | | | | 1 | | 1 |
| | | | | | | | 1 | | 5 | | 2 |
| | | | | | | 1 | | 19 | | 62 | | 8 |
| | | | | | 1 | | 65 | | 1322 | | 1976 | | 48 |
| | | | | 1 | | 211 | | 24182 | | 318392 | | 140496 | | 480 |
| | | | 1 | | 665 | | 408842 | | 42729464 | | 260656752 | | 19373280 | | 5760 |
| | | 1 | | 2059 | | 6609302 | | 5208402488 | | 395975417424 | | 485262187680 | | 4125121920 | | 92160 |
| | 1 | | 6305 | | 103999562 | | 600582229496 |
|
A281890 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 5 | 19 | 65 | 211 | 665 | 2059 | 6305
| | 2 | 62 | 1322 | 24182 | 408842 | 6609302 | 103999562
| | 8 | 1976 | 318392 | 42729464 | 5208402488 | 600582229496
| | 48 | 140496 | 260656752 | 395975417424
| | 480 | 19373280 | 485262187680
| | 5760 | 4125121920
| | 92160
|
A281890 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 5 | 19 | 65 | 211 | 665 | 2059 | 6305
| | | 2 | 62 | 1322 | 24182 | 408842 | 6609302 | 103999562
| | | | 8 | 1976 | 318392 | 42729464 | 5208402488 | 600582229496
| | | | | 48 | 140496 | 260656752 | 395975417424
| | | | | | 480 | 19373280 | 485262187680
| | | | | | | 5760 | 4125121920
| | | | | | | | 92160
| | | | | | | |
|
|
