22473

Appears in sequences

• a(n) = (2*n-1)*(5*n^2-5*n+2)/2.at n=16A063495
• a(n) = n*(4*n^2+5*n-3)/2.at n=21A126335
• a(n) = (122n^3 + 140n^2 + 45n + 3n(-1)^n)/8.at n=11A191698
• Sum of all the middle parts in the partitions of 3n into 3 parts.at n=32A236364
• Sum of the middle parts in the partitions of 4n-1 into 3 parts.at n=24A240707
• a(1) = a(2) = 2; a(n) = a(n-1) + gpf(a(n-2)), where gpf is greatest prime factor.at n=42A258125
• Expansion of Product_{k>=1} 1/(1-x^(3*k-2))^k.at n=44A262877
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 305", based on the 5-celled von Neumann neighborhood.at n=32A271162