61902

Appears in sequences

• a(n) = n*(n - 1)*(n^2 + 1)/2.at n=19A071252
• a(n) = a(n-2)*2 + floor(sqrt(a(n-1))).at n=30A182559
• Sum of the largest parts in the partitions of 4n into 4 parts with smallest part = 1.at n=26A240711
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 641", based on the 5-celled von Neumann neighborhood.at n=35A273311
• Number of partitions p of n such that (number of numbers in p that have multiplicity 1) != (number of numbers in p having multiplicity > 1).at n=44A330147
• Partial sums of A006010.at n=18A335648
• Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of regions in that figure.at n=35A337700