<v, Krein array>
<1520, [ 56, 361/7, 912/49, 1, 152/49, 228/7 ]>

P =
[  1 245 784 490]
[  1  55  24 -80]
[  1   5 -16  10]
[  1 -15  24 -10]

Q =
[     1     56    931    532]
[     1   88/7     19 -228/7]
[     1   12/7    -19  114/7]
[     1  -64/7     19  -76/7]

L = 
[
    [1 0 0 0]
    [0 1 0 0]
    [0 0 1 0]
    [0 0 0 1],

    [  0 245   0   0]
    [  1  60 144  40]
    [  0  45 125  75]
    [  0  20 120 105],

    [  0   0 784   0]
    [  0 144 400 240]
    [  1 125 408 250]
    [  0 120 400 264],

    [  0   0   0 490]
    [  0  40 240 210]
    [  0  75 250 165]
    [  1 105 264 120]
]

L* =
[
    [1 0 0 0]
    [0 1 0 0]
    [0 0 1 0]
    [0 0 0 1],

    [     0     56      0      0]
    [     1   24/7  361/7      0]
    [     0 152/49  240/7 912/49]
    [     0      0  228/7  164/7],

    [     0      0    931      0]
    [     0  361/7    570 2166/7]
    [     1  240/7    570 2280/7]
    [     0  228/7    570 2299/7],

    [      0       0       0     532]
    [      0       0  2166/7  1558/7]
    [      0  912/49  2280/7 9196/49]
    [      1   164/7  2299/7  1254/7]
]