191530

Appears in sequences

• a(n) = Sum_{k=0..n} (k+1) * A026769(n, k).at n=13A027243
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant = 0 (mod 3).at n=25A211033
• G.f.: Sum_{n=-oo..+oo} Fibonacci(n+1) * x^n * (1-x^n)^n.at n=26A292498
• Number of nX6 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.at n=21A298091