41846

Appears in sequences

• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.at n=8A150575
• Number of strings of numbers x(i=1..n) in 0..4 with sum i*x(i) equal to n*4.at n=12A184698
• a(n) is the cardinality of the set S(n) obtained by the following process: Start with the set S(0) = {i}, where i is the imaginary unit. In step n, the set S(n) is the union of all Gaussian integers obtained by the m*(m+1)/2 sums and the m*(m+1)/2 products formed with the pairs of numbers in the Cartesian product S(n-1) x S(n-1) with m = card(S(n-1)).at n=5A353536