-2019

Appears in sequences

• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 461", based on the 5-celled von Neumann neighborhood.at n=25A272294
• a(n) = [x^n] Product_{k=1..n} (1 - x^k)^(n-k+1).at n=11A303173
• a(n) = n - 2^(sum of digits of n).at n=29A328882