31823

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n-4)/2.at n=17A048060
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= (n+3)/3.at n=17A048082
• T(n,k)=S(2n+2,n-1,k-1), 0<=k<=n, n >= 0, array S as in A050157.at n=43A050162
• Triangular spiral sequence: sequence is written as a triangular spiral, each entry is the sum of the row in the previous direction containing the previous entry.at n=33A063177
• a(n) = C(n,7)-1.at n=11A124090
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, -1, 0), (-1, 1, 1), (1, 0, 1), (1, 1, 0)}.at n=8A150387
• Indices of primes in the tribonacci-like sequence, A214727.at n=13A234696
• Number of parts in all partitions of n in which no part occurs more than four times.at n=31A320607
• First term of n-th difference sequence of (floor(k*r)), r = 1/2 + sqrt(2), k >= 0.at n=18A325733
• a(n) = number of nonempty subsets S of {1,2,...,n} such that (number of nonprimes in S) = (number of primes in S).at n=18A369854