Does this help?
sage: for t in crystals.Tableaux("A2", shape=[2, 1]):
....: unicode_art(t)
....:
┌───┬───┐
│ 1 │ 1 │
├───┼───┘
│ 2 │
└───┘
┌───┬───┐
│ 1 │ 2 │
├───┼───┘
│ 2 │
└───┘
┌───┬───┐
│ 1 │ 3 │
├───┼───┘
│ 2 │
└───┘
┌───┬───┐
│ 1 │ 3 │
├───┼───┘
│ 3 │
└───┘
┌───┬───┐
│ 2 │ 3 │
├───┼───┘
│ 3 │
└───┘
┌───┬───┐
│ 1 │ 1 │
├───┼───┘
│ 3 │
└───┘
┌───┬───┐
│ 1 │ 2 │
├───┼───┘
│ 3 │
└───┘
┌───┬───┐
│ 2 │ 2 │
├───┼───┘
│ 3 │
└───┘
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