100920

Appears in sequences

• Number of equilateral triangles formed by triples of points taken from a hexagonal chunk of side n in the hexagonal lattice.at n=15A008893
• Expansion of e.g.f. arctan(exp(x) - sec(x)).at n=10A013331
• exp(sec(x)-cosh(x))=1+4/4!*x^4+60/6!*x^6+1944/8!*x^8+100920/10!*x^10...at n=5A013502
• Multiplicity of highest weight (or singular) vectors associated with character chi_158 of Monster module.at n=41A034546
• Number of paths of length n between two arbitrary, distinct vertices in K7, the complete graph on 7 vertices.at n=8A108509
• Triangle read by rows: T(n,m)=A060187(1+n,1+m) *n! / (n-m)!at n=18A177429
• Values of the difference d for 6 primes in arithmetic progression with the minimal start sequence {7 + j*d}, j = 0 to 5.at n=21A206040
• Solution of the complementary equation a(n) = 2*a(n-1) - a(n-3) + b(n-1), where a(0) = 2, a(1) = 4, a(2) = 6, b(0) = 1, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=19A295615
• Triangle read by rows: T(n,k) = number of open trails of length k starting and ending at fixed distinct vertices in the complete undirected graph on n labeled vertices, for n >= 1 and k = 0 .. n*(n-1)/2.at n=50A357886