-230

Appears in sequences

• Expansion of g.f.: 1/(1 + 2*x + 9*x^2).at n=5A025170
• McKay-Thompson series of class 42B for Monster.at n=57A058672
• Expansion of (1-x)/(1+x-x^2+x^3).at n=9A078042
• a(n) = (n+1)*(2-n)/2.at n=22A080956
• Sum at 45 degrees to horizontal in triangle of A081498.at n=28A081499
• Expansion of eta(q^2) * eta(q^30) / (eta(q^3) * eta(q^5)) in powers of q.at n=62A094022
• Values of z arising from representations of -n in A102535.at n=23A102809
• Expansion of Im(x/(1 - x - 2*i*x^2)), i=sqrt(-1).at n=11A106202
• Row sums of inverse of sequence array for Euler phi function.at n=25A106480
• Row sums of number triangle related to the Jacobsthal numbers.at n=11A110325
• Inverse of renewal array for central trinomial numbers.at n=73A111963
• Expansion of psi(x)^5 / psi(x^5) - 25*x^2 * psi(x) * psi(x^5)^3 in powers of x where psi() is a Ramanujan theta function.at n=47A113259
• a(0) = 121; for n>0, a(n) = a(n-1) - n + 1.at n=27A137517
• Expansion of f(q)^5 / f(q^5) in powers of q where f() is a Ramanujan theta function.at n=47A138506
• Triangle read by rows: real part of Lerch Phi expansion of p(x,n) = 2^n*(1 - i*x)^(n+1) * LerchPhi(i*x, -n, 1/2).at n=12A143196
• Expansion of q^(1/4) * eta(q^5)^2 * eta(q^20) / (eta(q^4) * eta(q^10)^2) in powers of q.at n=63A146165
• Riordan array (1/(1-x^2), x/(1+x)^2).at n=41A158454
• Coefficient array for square of Chebyshev S-polynomials.at n=37A181878
• Alternating LCM-sum: a(n) = Sum_{k=1..n} (-1)^(k-1)*lcm(k,n).at n=22A199806
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of A203905.at n=38A203906