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 A224873 Triangle of coefficients T(n, k) (n > 0, k < n) in expansion of sin(u*x) * sin(v*x) / (cos(u*x) + cos(v*x)), read by rows. 0
 1, 1, 1, 3, 25, 3, 17, 329, 329, 17, 155, 5325, 14301, 5325, 155, 2073, 110605, 563013, 563013, 110605, 2073, 38227, 2918825, 23904881, 45956625, 23904881, 2918825, 38227, 929569, 96075665, 1150348017, 3600524785, 3600524785, 1150348017, 96075665, 929569 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Table of n, a(n) for n=1..36. Michael Hardy, A "known" tangent half-angle formula?. FORMULA A024235(n) = Sum_{k = 0..n-1} T(n, k). A110501(n) = T(n, 0). E.g.f.: sin(u*x) * sin(v*x) / (cos(u*x) + cos(v*x)) = Sum_{n>0, k

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Last modified August 14 18:32 EDT 2024. Contains 375166 sequences. (Running on oeis4.)