-- -*- M2-comint -*- {* hash: -828499914 *}

i1 : G = flagBundle({2,2}, VariableNames => {,c})

o1 = G

o1 : a flag bundle with ranks {2, 2}

i2 : (S,Q) = G.Bundles

o2 = (S, Q)

o2 : Sequence

i3 : B = symmetricPower(3,Q)

o3 = B

o3 : an abstract sheaf of rank 4 on G

i4 : c = chern(rank B,B)

        2
o4 = 27c
        2

                     QQ[][H   , H   , c , c ]
                           1,1   1,2   1   2
o4 : --------------------------------------------------------
     (H    + c , H    + H   c  + c , H   c  + H   c , H   c )
       1,1    1   1,2    1,1 1    2   1,2 1    1,1 2   1,2 2

i5 : integral c

o5 = 27

o5 : QQ[]

i6 : f = n->(G = flagBundle({n-1,2}); integral chern(symmetricPower(2*n-3,(G.Bundles)_1)))

o6 = f

o6 : FunctionClosure

i7 : for n from 2 to 8 do print( time f(n))
     -- used 0.002 seconds
1
     -- used 0.003999 seconds
27
     -- used 0.008999 seconds
2875
     -- used 0.045993 seconds
698005
     -- used 0.038994 seconds
305093061
     -- used 0.096985 seconds
210480374951
     -- used 0.179973 seconds
210776836330775

i8 :