104940

Appears in sequences

• a(n) = 81n^2 - n.at n=35A157953
• a(n) = 324n^2 - 2n.at n=17A158305
• a(n) = 1296*n^2 - 36.at n=8A158737
• Number of -n..n arrays of 4 elements with zero sum and no two neighbors summing to zero.at n=26A199833
• (Denominators of Cauchy numbers of the first kind c_{2n})/6.at n=25A222560
• (Denominators of Cauchy numbers of the second kind hat c_{2n})/6.at n=25A222561
• a(n) = n^4 - 2n.at n=18A246767
• a(n) = lcm{!2, !3, ..., !n}, where !n = A000166(n) is subfactorial.at n=4A260656
• a(n) = floor(2^n/(-1 + cot(1/n))).at n=20A332431
• G.f. A(x,y) satisfies 1/x = Sum_{n=-oo..+oo} A(x,y)^n * (A(x,y)^n + y)^(n+1), as a triangle of coefficients T(n,k) of x^n*y^k in A(x,y), read by rows.at n=51A379200