117481

Appears in sequences

• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Fibonacci numbers), t = A001950 (upper Wythoff sequence).at n=30A024465
• Numbers k that divide the (left) concatenation of all numbers <= k written in base 25 (most significant digit on left).at n=27A029494
• a(n) = (3 + 2*n + 6*n^2 + 4*n^3)/3.at n=44A166464
• Expansion of 1 / ((1 - x)^7*(1 + x)^2).at n=22A299335
• a(n) is the number of 6-tuples (a_1,a_2,a_3,a_4,a_5,a_6) having all terms in {1,...,n} such that there exists a hexagon with these side-lengths.at n=7A346638
• Starting from 1, successively take the smallest "Choix de Bruxelles" with factor 13 which is not already in the sequence.at n=11A360190