20373

Appears in sequences

• "AFK" (ordered, size, unlabeled) transform of 2,1,1,1,...at n=26A032006
• Number of partitions of n with equal nonzero number of parts congruent to each of 0 and 2 (mod 4).at n=49A035547
• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2^(p+1) + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 3.at n=14A049957
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=55A051965
• Sum of n-th antidiagonal of array in A081998.at n=20A082001
• Row sums of number triangle A110180.at n=10A110181
• Number of permutations of length n which avoid the patterns 1234, 1342, 4312.at n=11A116791
• a(n) = prime(prime(n*n) - n*n) - n*n where prime(n) is the n-th prime.at n=19A141127
• 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, 0, 0), (-1, 1, -1), (1, -1, 0), (1, 1, 0)}.at n=9A149127
• Number of conjugacy classes of the symmetric group S_n when conjugating by the dihedral group D_n.at n=8A242099
• a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(4*k,k) / (3*k + 1).at n=7A346664