190224

Appears in sequences

• a(n)= 4*a(n-1) +18*a(n-2) -48*a(n-3) -60*a(n-4) +80*a(n-5) +56*a(n-6).at n=4A121800
• Triangle T(n,k) read by rows: coefficient [x^(n-k)] of the characteristic polynomial of the n X n matrix A(r,c)=1 (if c > r) and A(r,c)=c (if c <= r).at n=53A158359
• a(n) = (n - 1)!*(2 + Harmonic(n - 1)) if n >= 1, and a(0) = 1.at n=9A387205