19954

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 68 ones.at n=35A031836
• a(n) = Sum_{k=0..floor(n/4)} C(n-2*k,2*k) * 3^k.at n=17A098576
• Expansion of g.f. (1/2)*( a*(1+x)^n + b*(1-x)^(n+2)*LerchPhi(x, -n-1, 1) + c*2^(n+1)*(1-x)^(n+1)*LerchPhi(x, -n, 1/2) ), where a = 3, b = -3, and c = 1, read by rows.at n=24A168552
• a(n) = n*(21*n-17)/2.at n=44A226491