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A059423
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Number of positive terms in a symmetric determinant of order n.
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2
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1, 1, 1, 2, 8, 38, 193, 1243, 8971, 77039, 711719, 7557974, 85038784, 1075040038, 14252911927, 208885729397, 3187988600057, 53129157538097, 917244939572929, 17127419083026706, 329981266766790136, 6823452191056396526, 145118585159785011041
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