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A001938 Expansion of k/(4q^(1/2)) in powers of q, where k is the elliptic function defined by sqrt(k) = theta_2/theta_3.
(Formerly M3475 N1412)
+0
10
1, -4, 14, -40, 101, -236, 518, -1080, 2162, -4180, 7840, -14328, 25591, -44776, 76918, -129952, 216240, -354864, 574958, -920600, 1457946, -2285452, 3548550, -5460592, 8332425, -12614088, 18953310, -28276968, 41904208, -61702876, 90304598, -131399624 (list; graph; listen)
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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