18922
domain: N
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 81.at n=17A020420
- Row sums of the Riordan array (1/(1+x),x(1+2x)/(1+x)^3)^(-1).at n=11A138175
- Numbers k such that (55*10^k + 377)/9 is prime.at n=19A294230
- E.g.f. A(x) satisfies: A(x) = sqrt( Sum_{n>=0} (x^n/n!) * exp(x*A(x)^n) ).at n=7A341379
- a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/2)} (-3)^k * a(k) * a(n-2*k-1).at n=13A352010
- a(n) = Sum_{k=0..floor(n/4)} 2^(n-4*k) * binomial(2*n-6*k+1,2*k+1).at n=9A387696