73489

Appears in sequences

• Riordan array (1/sqrt(1-4*x), (1/sqrt(1-4*x)-1)/2).at n=48A116395
• Total number of 231 patterns in the set of permutations avoiding 123.at n=8A210064
• Arises from color-symmetrized counting of tensor invariants.at n=15A232207
• Triangle read by rows: T(n,k) is the coefficient A_k in the transformation Sum_{k=0..n} x^k = Sum_{k=0..n} A_k*(x-2*(-1)^k)^k.at n=22A249267
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 809", based on the 5-celled von Neumann neighborhood.at n=41A273612