26380

Appears in sequences

• Array (a frieze pattern) defined by a(n,k) = (a(n-1,k)*a(n-1,k+1) - 1) / a(n-2,k+1), read by antidiagonals.at n=43A007754
• a(n) = n*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1.at n=8A058798
• Sum of squares of four consecutive primes.at n=20A133524
• Unmatched value maps: number of 2 X n binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 2 X n array.at n=9A218843
• Numbers n such that n^9+9 and n^9-9 are prime.at n=24A239505
• Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally and vertically.at n=1A254450
• Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally and vertically.at n=1A254451
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally and vertically.at n=4A254457
• a(n) = 5*6^n - 4*5^n.at n=5A257286
• a(0) = 1, a(1) = 2; for k>0, a(2*k) = k*a(2*k-1) + a(2*k-2), a(2*k+1) = a(2*k) + a(2*k-1).at n=13A273939
• Number of 3Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=18A302165
• Number of tilings of a 5 X n rectangle using n pentominoes of shapes X, Y, Z.at n=20A349187
• Table read by downward antidiagonals: T(n,k) is the number of tilings of the n X k torus up to horizontal reflections by a tile that is not fixed under horizontal reflection.at n=32A368306