-434

Appears in sequences

• Percolation series for directed square lattice.at n=8A006835
• Expansion of Product_{m>=1} (1 + m*q^m)^-2.at n=13A022694
• McKay-Thompson series of class 30C for Monster.at n=41A058614
• Expansion of (1-x-x^N)/((1-x)(1-x^2)(1-x^3)...(1-x^N)) for N = 4.at n=40A060023
• a(n) = (n+1)*(2-n)/2.at n=30A080956
• Expansion of (chi(-q^3)^8 + 16*q^2/ chi(-q^3)^8)^(1/8) in powers of q where chi() is a Ramanujan theta function.at n=7A106204
• Row sums of number triangle related to the Jacobsthal numbers.at n=15A110325
• a(n) = -n^2 - n + 72.at n=22A110678
• Riordan array ((1+3*x-sqrt(1+2*x+9*x^2))/(2*x),(1+3*x-sqrt(1+2*x+9*x^2))/2).at n=51A125694
• McKay-Thompson series of class 30C for the Monster group with a(0) = -1.at n=41A132321
• Triangle, read by rows of coefficients of x^n*y^k for k=0..n(n-1)/2 for n>=0, defined by e.g.f.: A(x,y) = 1 + Series_Reversion( Integral A(-x*y,y) dx ), with leading zeros in each row suppressed.at n=36A144006
• Numerator of Hermite(n, 2/15).at n=2A159514
• Numerator of Hermite(n, 6/17).at n=2A159534
• Triangle read by rows: T(n,0) = n+1, T(n,k) = 2*T(n-1,k) - T(n-1,k-1), T(n,k) = 0 if k > n and if k < 0.at n=41A159856
• Numerator of Hermite(n, 16/27).at n=2A160142
• a(n) is the sum of the first column of the difference table of the divisors of n.at n=59A161857
• Riordan array T((1-x)^(-2) | 2x-1) read by rows.at n=32A181690
• Alternating LCM-sum: a(n) = Sum_{k=1..n} (-1)^(k-1)*lcm(k,n).at n=30A199806
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A202874; by antidiagonals.at n=25A202875
• G.f.: x^(k^2)/(mul(1-x^(2*i),i=1..k)*mul(1+x^(2*r-1),r=1..oo)) with k=4.at n=35A246580