18396

Appears in sequences

• Number of ways of writing n as a sum of 6 squares.at n=36A000141
• Theta series of D_6 lattice.at n=18A008428
• Coordination sequence for 4-dimensional face-centered cubic orthogonal lattice.at n=14A008529
• Coordination sequence for sigma-CrFe, Position Xc.at n=34A009961
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,11.at n=6A064242
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,15.at n=35A064244
• G.f.: 1/Product_{k>0} (1-x^k)^A000669(k+1).at n=10A106606
• Numbers n such that the sum of the digits of phi(n)^sigma(n) is divisible by n.at n=19A109668
• Numbers k such that tau(k) = tau(k+1) mod 691, where tau is Ramanujan's tau function A000594.at n=28A121733
• Triangle T(n, k) = Sum_{m=0..k} Sum_{j=0..m} Multinomial(n-k-m-j, j, m, k), read by rows.at n=49A141724
• Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.at n=9A162921
• Number of alternating polynomials of degree 3n in GF(2)[X], n>0.at n=18A165912
• Triangle T(m,n) read by rows: T(m,n) = Sum_{k=1..n} StirlingS2(m, n) * StirlingS2(m, k).at n=26A167128
• A binomial conjugate of the Narayana numbers.at n=49A177896
• a(n) = 7*n*(2*n + 1).at n=36A195026
• Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 2.at n=35A209984
• Number of (w,x,y,z) with all terms in {0,...,n} and 2w=max{w,x,y,z}-min{w,x,y,z}.at n=34A212757
• a(n) = smallest k such that prime(n) is the n-th largest divisor of k.at n=20A226326
• Number of ways of writing n^2 as a sum of n squares.at n=6A232173
• Number of partitions p of n such that the number of parts having multiplicity 1 is a part and max(p) - min(p) is not a part.at n=40A241449