const [sequence1, sequence2] = await client.sequences.retrieve([{id: 123}, {externalId: 'abc'}]);

{
  "items": [
    {
      "id": 1,
      "columns": [
        {
          "valueType": "DOUBLE",
          "createdTime": 100000000000,
          "lastUpdatedTime": 100000000000,
          "name": "depth",
          "externalId": "DPS1",
          "description": "Optional description",
          "metadata": {
            "extracted-by": "cognite"
          }
        }
      ],
      "createdTime": 100000000000,
      "lastUpdatedTime": 100000000000,
      "name": "Any relevant name",
      "description": "Optional description",
      "assetId": 1221123111,
      "externalId": "my.known.id",
      "metadata": {
        "extracted-by": "cognite"
      },
      "dataSetId": 2718281828459
    }
  ]
}