18410

Appears in sequences

• Symmetries in planted (1,3) trees on 2n vertices.at n=11A003609
• Weird numbers: abundant (A005101) but not pseudoperfect (A005835).at n=30A006037
• Expansion of (1-x^5) / (1-x)^5.at n=28A008487
• a(n) = Sum{a(k): k=0,1,2,...,n-4,n-2,n-1}; a(n-3) is not a summand; initial terms are 2,2,3.at n=16A049873
• Unitary weird numbers: unitary abundant (A034683) but not unitary pseudoperfect (A293188).at n=27A064114
• a(n) = 2*Fibonacci(n) + 8*Fibonacci(n-5).at n=15A101156
• Number of base 8 circular n-digit numbers with adjacent digits differing by 1 or less.at n=9A124701
• Numbers n with property that n^2 is a sum of some 70 successive primes.at n=28A166256
• Number of ways to place 2 nonattacking knights on an n X n cylindrical board.at n=13A172964
• Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order.at n=5A204476
• Number of (n+2)X8 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order.at n=5A204481
• Trajectory of 262 under repeated application of the permutation A264965: a(0) = 262; for n >= 1, a(n) = A264965(a(n-1)).at n=7A264972
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 913", based on the 5-celled von Neumann neighborhood.at n=23A273768
• Bi-unitary weird numbers: bi-unitary abundant numbers (A292982) that are not bi-unitary pseudoperfect (A292985).at n=32A292986
• Numbers k such that Bernoulli number B_{k} has denominator 4686.at n=13A295770
• Infinitary weird numbers: infinitary abundant numbers (A129656) that are not infinitary pseudoperfect numbers (A306983).at n=33A306984
• T(n, k) = Sum_{j=1..k} (1 + 2*cos(j*Pi/(k + 1)))^n for n > 0, T(0, 0) = 1. Triangle read by rows, T(n, k) for 0 <= k <= n.at n=53A342911
• Nonexponential weird numbers: nonexponential abundant numbers (A348604) that are not equal to the sum of any subset of their nonexponential divisors.at n=24A348631
• (1+e)-weird numbers: (1+e)-abundant numbers k such that no subset of the aliquot (1+e)-divisors of k sums to k.at n=25A349285