74649

Appears in sequences

• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 3, 1, 1, 3.at n=11A025254
• Expansion of 3*(1+2*x-2*x^2)/((1-x)*(1-6*x^2)).at n=11A026551
• a(n) = least integer that begins a run of exactly n consecutive integers that can be the hypotenuse of a Pythagorean triangle.at n=19A099799
• Diagonal sums of second binomial transform of the Narayana triangle A001263.at n=9A178578