279300

Appears in sequences

• a(n) = n*(n+1)^2*(n+2)^2/12.at n=19A004282
• a(n) = floor(n/2) * floor((n-1)/2) * floor((n-2)/2) * floor((n-3)/2) * floor((n-4)/2) / 12.at n=43A028725
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=18A193007
• Number of n X 6 nonnegative integer arrays with upper left 0 and every value within 2 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down.at n=6A252818
• Number of nX7 nonnegative integer arrays with upper left 0 and every value within 2 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down.at n=5A252819
• Exponential weird numbers: numbers that are exponential abundant (A129575) but not exponential pseudoperfect (A318100).at n=17A321146
• a(n) is the number of subsets of {1..n} that contain exactly 2 odd and 3 even numbers.at n=42A330300
• Coreful weird numbers: numbers k that are coreful abundant (A308053) but no subset of their aliquot coreful divisors sums to k.at n=17A339939
• Integers x such that there exist four integers 0<y<=z<=t<=w such that sigma(x)^5 = x^5 + y^5 + z^5 + t^5 + w^5.at n=16A386672