20575

Appears in sequences

• Numerator of partial sums of a certain series.at n=3A101631
• Integer part of Sum_{k>=0} Sum_{j=0..k} n^j*A107045(k,j)/A107046(k,j).at n=21A107055
• Number of (w,x,y,z) with all terms in {0,...,n} and (least gapsize)<=2.at n=12A212898
• Numerators of sum of rows of the inverse of the triangle of Euler polynomial coefficients P(0,x)=1, 2P(n,x)=(1+x)*[(1+x)^(n-1)+x^(n-1)].at n=14A230011
• Index sequence for limit-block extending A000002 (Kolakoski sequence) with first term as initial block.at n=40A246145
• Coordination sequence for (2,3,8) tiling of hyperbolic plane.at n=40A265058
• Starts of runs of 3 consecutive numbers that have an equal number of unitary and nonunitary prime divisors (A348097).at n=20A348099
• a(n) = Sum_{d|n} (n/d) * 3^(n-d).at n=7A359203
• Number of unlabeled simple connected graphs with n nodes of degree at most 3 and each node a member of exactly one cycle.at n=24A380805
• Number of distinct subsets S of [n] such that for all 1 <= k <= n, there exist elements x,y in S (not necessarily distinct) such that x*y = 2k.at n=24A384330