21118
domain: N
Appears in sequences
- Numbers whose least quadratic nonresidue (A020649) is 23.at n=2A025028
- Indices n such that A134204(n) < n.at n=28A133242
- Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 1), (0, 1), (1, -1)}.at n=7A151333
- Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) = (x+1) * (2x+1) * ... *(nx+1).at n=6A192463
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 403", based on the 5-celled von Neumann neighborhood.at n=31A271809
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 553", based on the 5-celled von Neumann neighborhood.at n=27A272848
- The excess of the number of partitions of n with more odd parts than even parts over the number of partitions of n with more even parts than odd parts.at n=42A338860