20850

Appears in sequences

• Number of points of L1 norm 3 in cubic lattice Z^n.at n=25A035597
• Coordination sequence for 25-dimensional cubic lattice.at n=3A035720
• 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) = a(2) = a(3) = 1.at n=15A049933
• Molien series for action of SL(3,C) on ternary forms of degree 4.at n=32A083024
• Partial sums of A011757.at n=20A109770
• Triangle T(n,k), 0<=k<=n, of coefficients of polynomials P_n(x) related to convolution of the k-fold factorials.at n=51A113129
• Numbers k such that the digits of sigma(k) are a permutation of those of k, in base 10.at n=22A115920
• a(n) = prime(n)*(prime(n+1) + 1).at n=33A123134
• Row sums of A168281.at n=48A168380
• Number of partitions of n, where the difference between the number of odd parts and the number of even parts is 1.at n=52A240010
• Indices of primes in the tribonacci-like sequence A214827.at n=30A242324
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 62", based on the 5-celled von Neumann neighborhood.at n=37A270081
• a(n) = T(n, 4) with T(n, k) = Sum_{d|k} phi(d)*binomial(n - 1 + k/d, k/d).at n=25A327032
• a(n) = n * Sum_{d|n} binomial(d+3,4)/d.at n=24A343545
• G.f. A(x,y) satisfies: x*y*A(x,y) = Sum_{n=-oo..+oo} (-1)^n * x^(n*(n+1)/2) * A(x,y)^n, with coefficients T(n,k) of x^n*y^k in A(x,y) given as a triangle read by rows.at n=39A355360