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#Octave, 38 37 35 bytes
@(n)[(x=1:n)+x'-1 z=~x'+2*n;z' 2*n]
Try it online!
or
@(n)~(k=blkdiag((x=1:n)+x'-1,0))*2*n+k
#Octave, 38 3737 35 bytes
@(n)[(x=1:n)+x'-1 ~x'+2*n;~[xz=~x'+2*n;z' 1]+2*n]2*n]
Try it online!Try it online!
#Octave, 38 37 bytes
@(n)[(x=1:n)+x'-1 ~x'+2*n;~[x 1]+2*n]
#Octave, 3838 37 bytes
@(n)[(x=1:n)+x'-1 ~x'+2*n; ~[x~x'+2*n;~[x 1]+2*n]
#Octave, 38 bytes
@(n)[(x=1:n)+x'-1 ~x'+2*n; ~[x 1]+2*n]
