-221

Appears in sequences

• Coefficients of the 3rd-order mock theta function f(q).at n=38A000025
• Coefficient of q^(2n) in the series expansion of Ramanujan's mock theta function f(q).at n=19A000039
• Numerator of [x^n] in the Taylor series arccosh(exp(x) - tan(x)) = x - x^2/6 - x^3/72 - 43*x^4/432 - 221*x^5/10368 - 89513*x^6/2177280 - ...at n=4A013307
• Triangle, read by rows, equal to the matrix inverse of Q=A113381.at n=33A114158
• Triangle read by rows: a(n,m)=(2*n-1)*(n-m)*(n+m+1)/2, where n is the column and m the row index.at n=43A120476
• Triangular table of numerators of the coefficients of Laguerre-Sonin polynomials L(1/2,n,x).at n=41A131440
• Expansion of (1-2x-5x^2-7x^3+x^6)/((1-x)(1-x^3)^2).at n=17A141352
• Polynomial expansion sequence : p(x)=1 + x^2 - x^3 - x^5 - x^7 + x^8 + x^10.at n=49A143604
• INVERT transform of A055615, n*mu(n).at n=9A144028
• Eigentriangle by rows, A055615(n-k+1)*A144028(k-1); 1<=k<=n.at n=54A144029
• Numerator of Euler(n, 13/30).at n=2A157490
• Numerator of Bernoulli(n, -3/10).at n=5A159011
• Numerators of coefficient array for minimal polynomials of sin(2*Pi/n). Rising powers of x.at n=96A181872
• Expansion of q^(2/3) * c(q) / c(q^3) in powers of q where c() is a cubic AGM theta function.at n=61A215625
• a(n) = (-1)^(n-3)*binomial(n,3) - 1.at n=9A216414
• a(n) = 13*a(n-1) - 65*a(n-2) + 156*a(n-3) - 182*a(n-4) + 91*a(n-5) - 13*a(n-6), with initial terms 0, 0, -1, -8, -45, -221.at n=5A216540
• Values of n such that L(1) and N(1) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=20A226921
• Values of n such that L(2) and N(2) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=7A226922
• Values of n such that L(19) and N(19) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=1A227522
• Expansion of (1 - x + x^2 + sqrt(1 + 2*x + 3*x^2 - 2*x^3 + x^4)) / 2 in powers of x.at n=14A239466