21703

Appears in sequences

• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 529", based on the 5-celled von Neumann neighborhood.at n=28A272748
• Expansion of -1/(1 - x)^2 + (1/(1 - x))*Product_{k>=1} (1 + x^k).at n=47A317910
• Numbers k such that k![4] - 128 is prime, where k![4] = A007662(k) = quadruple factorial.at n=37A329176
• Positions of 0's in A330314.at n=26A330325