Cheddar, 26 bytes

n g->n?g(n-=1)**2-g(n)+1:2 

Pretty idiomatic.

Explanation

n g -> // Input n, g is this function n ? // if n is > 1 g(n-=1)**2-g(n)+1 // Do equation specified in OEIS : 2 // if n == 0 return 2 

Cheddar, 26 bytes

n g->n?g(n-=1)**2-g(n)+1:2 

Try it online!

Pretty idiomatic.

Explanation

n g -> // Input n, g is this function n ? // if n is > 1 g(n-=1)**2-g(n)+1 // Do equation specified in OEIS : 2 // if n == 0 return 2 

Cheddar, 26 bytes

n g->n?g(n-=1)**2-g(n)+1:2 

Try it online!

Cheddar is only three times longer than Jelly!

Cheddar, 26 bytes

n g->n?g(n-=1)**2-g(n)+1:2 

Pretty idiomatic.

Explanation

n g -> // Input n, g is this function n ? // if n is > 1 g(n-=1)**2-g(n)+1 // Do equation specified in OEIS : 2 // if n == 0 return 2 

Cheddar, 26 bytes

n g->n?g(n-=1)**2-g(n)+1:2 

Cheddar is only three times longer than Jelly!

Cheddar, 26 bytes

n g->n?g(n-=1)**2-g(n)+1:2 

Try it online!

Cheddar is only three times longer than Jelly!