pascal's triangle mod 4 - Wolfram|Alpha

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Input interpretation

Pascal's triangle | mod 4

Result

| | | | | 1 | | | | |
| | | | 1 | | 1 | | | |
| | | 1 | | 2 | | 1 | | |
| | 1 | | 3 | | 3 | | 1 | |
| 1 | | 0 | | 2 | | 0 | | 1 |
1 | | 1 | | 2 | | 2 | | 1 | | 1

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