-1451

Appears in sequences

• Matrix inverse of triangle A055898.at n=45A055905
• Column 0 of triangle A055905.at n=9A055906
• a(n) = A174817(n) - Mnr; where Mnr = A001228(26) = 808017424794512875886459904961710757005754368000000000, also called the Monster number, cf. A003131.at n=22A174818
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 129", based on the 5-celled von Neumann neighborhood.at n=23A270220
• a(n) = 2^(n+1)*cos(n*arctan(sqrt(15))).at n=11A272931
• L.g.f.: log(Sum_{k>=0} k! * x^(k*(k + 1)/2) / Product_{j=1..k} (1 - x^j)).at n=17A331337
• a(n) = -n^2 + 21*n - 1.at n=49A332884
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/2)} (-4)^k * a(k) * a(n-2*k-1).at n=9A352011