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 A320233 Expansion of Product_{k=1..7} theta_3(q^k), where theta_3() is the Jacobi theta function. 9
 1, 2, 2, 6, 8, 10, 22, 26, 34, 54, 68, 84, 114, 144, 156, 216, 256, 268, 350, 384, 414, 508, 564, 560, 686, 758, 736, 914, 966, 948, 1140, 1308, 1182, 1460, 1640, 1464, 1928, 2024, 1928, 2228, 2564, 2320, 2748, 3164, 2584, 3350, 3640, 3232, 3738, 4314, 3566, 4400 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Also the number of integer solutions (a_1, a_2, ... , a_7) to the equation a_1^2 + 2*a_2^2 + ... + 7*a_7^2 = n. LINKS Seiichi Manyama, Table of n, a(n) for n = 0..10000 Eric Weisstein's World of Mathematics, Jacobi Theta Functions CROSSREFS Product_{k=1..m} theta_3(q^k): A000122 (m=1), A033715 (m=2), A029594 (m=3), A320139 (m=4), A320231 (m=5), A320232 (m=6), this sequence (m=7), A320234 (m=8). Cf. A320067. Sequence in context: A033760 A320231 A320232 * A320234 A320241 A320242 Adjacent sequences:  A320230 A320231 A320232 * A320234 A320235 A320236 KEYWORD nonn,look AUTHOR Seiichi Manyama, Oct 08 2018 STATUS approved

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Last modified January 17 23:37 EST 2020. Contains 330995 sequences. (Running on oeis4.)