bluecube

import math
import numpy

_permutation = numpy.array([   6,  36, 184,  45, 107,  67,   2,  34,  82, 181, 110, 188,  69, 152, 142,   0,
                             224, 154, 236, 203, 157,  73, 171, 115, 138,  66, 252, 165, 155,  60, 229,  95,
                             141, 202,  58, 132,  76,  94, 160,  53, 170, 242, 235,  81, 139,  84, 240, 153,
                             130, 148, 228,  97, 105, 201, 135, 237,  62, 232, 163, 136, 143, 255, 147, 178,
                             204, 127, 227, 249, 253,  77, 145,  91,  19,  72,  24, 108, 144, 233, 101,  40,
                              20,  37, 200,  29,  54,  27,  55,  46, 234,  50, 213,  64,  17, 231,  25,  10,
                              70, 146, 205, 222,  80, 162,  59,  86,  12, 125, 192, 124, 246,  83, 114,  93,