90944

Appears in sequences

• Card-matching numbers (Dinner-Diner matching numbers).at n=25A059058
• Card-matching numbers (Dinner-Diner matching numbers).at n=18A059068
• Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A082339/A082340.at n=13A089430
• Number of permutations of n distinct letters (ABCD...) each of which appears thrice with three fixed points.at n=3A124043
• Number of nondecreasing arrangements of n+3 numbers in 0..4 with each number being the sum mod 5 of three others.at n=32A183899
• a(n) is the least integer m such that A047994(m) = ((n-2)/n)*m where A047994 is the unitary totient function, or 0 if there is no such m.at n=26A319313
• Conductor of elliptic curve y^2 = x^3 - n*x - n.at n=13A387891
• a(n) = (1/4) * Sum_{k=0..floor(n/2)} (k+2) * 2^k * binomial(2*k+2,2*n-4*k+1).at n=13A391833