-234

Appears in sequences

• Coefficients of modular function G_3(tau).at n=21A005761
• Expansion of tanh(sin(x)*x).at n=3A009800
• Imaginary Rabbits: imaginary part of a(0)=i; a(1)=-i; a(n) = a(n-1) + i*a(n-2), with i = sqrt(-1).at n=17A014291
• a(n) = -(1/2)*(n+2)*(n^2 - 6*n - 1).at n=10A028494
• Expansion of eta(q^2)^12 / theta_3(q)^3 in powers of q.at n=17A029769
• Triangle read by rows: matrix 4th power of the Stirling-1 triangle A008275.at n=6A039816
• Matrix 9th power of inverse partition triangle A038498.at n=57A050312
• a(n) = floor(Sum_{k=0..n} tan(k)).at n=32A051508
• a(n) = floor(Sum_{k=0..n} tan(k)).at n=30A051508
• a(n) = round(Sum_{k=0..n} tan(k)).at n=30A051509
• a(n) = round(Sum_{k=0..n} tan(k)).at n=32A051509
• a(n) = round(Sum_{k=0..n} tan(k)).at n=31A051509
• a(n) = ceiling(Sum_{k=0..n} tan(k)).at n=31A051510
• a(n) = ceiling(Sum_{k=0..n} tan(k)).at n=11A051510
• Coefficients of the '6th-order' mock theta function phi(q).at n=45A053268
• Dirichlet inverse of sigma_2 function (A001157).at n=44A053822
• McKay-Thompson series of class 14b for Monster.at n=62A058506
• McKay-Thompson series of class 15B for Monster.at n=25A058509
• a(n) = + 1 - 2 - 3 + 4 + 5 + 6 - 7 - 8 - 9 - 10 + 11 + 12 + 13 + 14 + 15 - ... + (+-1)*n, where there is one plus, two minuses, three pluses, etc. (see A002024).at n=55A064520
• McKay-Thompson series of class 24f for the Monster group with a(0) = -2.at n=25A093067