26345

Appears in sequences

• a(n) = d(n)/2, where d = A026040.at n=51A026041
• a(n) = number of (s(0),s(1),...,s(n)) such that every s(i) is a nonnegative integer, s(0) = 1, s(n) = 4, |s(1) - s(0)| = 1, |s(i) - s(i-1)| <= 1 for i >= 2. Also a(n) = T(n,n-3), where T is the array in A026120.at n=9A026125
• Numbers n such that product of double factorials of the digits of n equals sigma(n).at n=9A158989
• Number of (w,x,y) with all terms in {0,...,n} and |w-x|+|x-y|+|y-w| != w+x+y.at n=29A213485
• Number of binary relations R on [n] such that the (unique) idempotent in {R,R^2,R^3,...} is an equivalence relation.at n=4A369397