20512

Appears in sequences

• Theta series of direct sum of 2 copies of f.c.c. lattice.at n=24A008663
• Conjectured formula for irreducible 6-fold Euler sums of weight 2n+16.at n=30A019459
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 71.at n=36A031569
• Numbers k that divide 4^k + 2^k or 8^k + 4^k.at n=46A045577
• Expansion of series related to Liouville's Last Theorem: g.f. sum_{t>0} (-1)^(t+1) *x^(t*(t+1)/2) / ( (1-x^t)^4 *product_{i=1..t} (1-x^i) ).at n=26A059821
• Number of pairs of rabbits when there are 3 pairs per litter and offspring reach parenthood after 3 gestation periods; a(n) = a(n-1) + 3*a(n-3), with a(0) = a(1) = a(2) = 1.at n=17A084386
• Numbers in A086473 corresponding to the unique product of two numbers having the unique sum of A086533.at n=22A086860
• Boustrophedon transform of Fibonacci numbers 1, 2, 3, 5, 8, ...at n=8A092090
• The first 10 digits of the fifth root of n contain the digits 0-9.at n=10A119520
• Number of nX4 1..2 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.at n=10A166786
• Number of line segments connecting exactly 5 points in an n x n grid of points.at n=31A177721
• Numbers k such that 12321*2^k + 1 is prime.at n=30A180924
• Numbers of quasi-espalier polycubes of a given volume (number of atomic cells).at n=31A230118
• Number of length 3 0..n arrays with each partial sum starting from the beginning no more than two standard deviations from its mean.at n=26A244834
• Number of (4+2) X (n+2) 0..3 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=28A252723
• Spherical growth function of the Lamplighter group L_2 with respect to the standard generators a, t.at n=17A288348
• Number of closed binary words of length n that are not privileged.at n=18A297184
• Positions of zeros in A345055, which is the Dirichlet inverse of A011772.at n=42A345053
• Numbers k that divide the k-th tangent (or "zag") number.at n=25A372944
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A384982.at n=33A384985