RosettaCodeData/Task/Fibonacci-sequence/Excel/fibonacci-sequence-3.excel

FIBONACCI2
=LAMBDA(n,
    INDEX(
        FOLDL(
            LAMBDA(ab,
                LAMBDA(_,
                    APPEND(INDEX(ab, 2))(SUM(ab))
                )
            )
        )({0;1})(
            ENUMFROMTO(1)(n)
        ),
        1
    )
)