2 Saved 5 bytes thanks to @LeakyNun
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Python, 4545 40 bytes

a=lambda n:n<3and 1orn<3or a(n-a(n-1))+a(n-a(n-2))

Simple naïve interpretation of the challenge.

Saved 5 bytes thanks to @LeakyNun!

Python, 45 bytes

a=lambda n:n<3and 1or a(n-a(n-1))+a(n-a(n-2))

Simple naïve interpretation of the challenge.

Python, 45 40 bytes

a=lambda n:n<3or a(n-a(n-1))+a(n-a(n-2))

Simple naïve interpretation of the challenge.

Saved 5 bytes thanks to @LeakyNun!

1
source | link

Python, 45 bytes

a=lambda n:n<3and 1or a(n-a(n-1))+a(n-a(n-2))

Simple naïve interpretation of the challenge.