42286

Appears in sequences

• a(n) = floor(exp(1/21) * n!).at n=7A030851
• G.f.: (1-x)*(1-2*x-x^2-(1-x)*sqrt(1-2*x-3*x^2))/(2*x*(1-2*x-x^2)).at n=12A257596
• Indices where A092243 strictly changes sign.at n=22A269737
• Numbers k such that (7*10^k - 13)/3 is prime.at n=26A273924
• G.f. A(x) satisfies: x*A(x) + x^2*A(x)^2 = C(x)^2, where C(x) = x + C(x)^2 is a g.f. of the Catalan numbers (A000108).at n=10A273958
• Number of n X 3 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.at n=7A304305
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.at n=47A304310