23816

Appears in sequences

• Coordination sequence for MgNi2, Position Ni2.at n=38A009932
• 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 77.at n=28A031575
• Triangle T(n,m) read by rows: matrix product A053121 * A038207.at n=56A096164
• a(1) = 2, a(n) = (n-th-even n^3) - (sum of previous terms).at n=32A181509
• Number of (w,x,y) with all terms in {0,...,n} and |w-x|+|x-y|+|y-w| <= w+x+y.at n=31A213487
• Numbers m such that the GCD of the x's that satisfy sigma(x) = m is 3.at n=40A241648
• a(n) = n*(n+1)*(n+2)*(n+3)*(n+4)*(n^2+4*n+37)/5040.at n=11A257201
• a(n) = 8*9^n - 7*8^n.at n=4A257289
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 734", based on the 5-celled von Neumann neighborhood.at n=35A273455
• Number of nX2 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=10A298148
• a(n) = 4*(n+1)*(9*n+4).at n=25A304505
• Expansion of e.g.f. exp(Sum_{k>=1} x^(k^2) / (k^2)!).at n=12A329256
• Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of edges in that figure.at n=23A337702
• Number of distinct sums i^3 + j^3 + k^3 + l^3 for 1<=i<=j<=k<=l<=n.at n=28A374714