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A144926 Number of n X n (-1,1)-circulant matrices with determinant 0. +0
2
0, 0, 4, 2, 8, 2, 40, 2, 128, 62, 504, 2, 1768, 2, 6864, 2738, 24192, 2, 107128, 2, 331096, 109334, 1410864, 2, 5880544, 206282, 20801200, 5417630, 73508696, 2, 345334744, 2, 1150681600, 278770214, 4667212440, 133401818, 19355912632, 2, 70690527600, 15151534406 (list; graph; listen)
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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.


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