-2430

Appears in sequences

• a(n) = -(n + 1)*(2*n^2 + n - 12)/6.at n=19A058372
• Triangle read by rows. T(n, m) are the coefficients of Sidi polynomials.at n=17A075513
• Triangle T, read by rows, where matrix power T^3 has powers of 3 in the secondary diagonal: [T^3](n+1,n) = 3^(n+1), with all 1's in the main diagonal and zeros elsewhere.at n=10A117252
• Column 0 of triangle A117252.at n=4A117253
• G.f. A(x) satisfies: A(A(A(x))) = x + 9*x^2.at n=4A141118
• Expansion of (1+27x^2-54x^3)/((1+3x)^2*(1-3x+9 x^2)).at n=5A168075
• Triangle read by rows: terms T(n,k) of a binomial decomposition of n as Sum(k=0..n)T(n,k).at n=23A244131
• Triangle read by rows: terms T(n,k) of a binomial decomposition of n*(-1)^n as Sum(k=0..n)T(n,k).at n=26A244141