19402

Appears in sequences

• a(n) = 10*a(n-1) - a(n-2) with a(0) = 0, a(1) = 2.at n=5A001078
• Denominators of continued fraction convergents to sqrt(6).at n=9A041007
• Denominators of continued fraction convergents to sqrt(54).at n=9A041093
• Square root of floor(A055851(n)/6).at n=16A204519
• G.f. satisfies: A(x) = 1 + Sum_{n>=0} x^n * (1 - A(x)^(2*n))/(1 - A(x)).at n=7A228907
• Number of (6+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two minimums of the central column and central row nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=9A254912
• Integers that are Rhonda numbers to base 18.at n=4A255735
• Expansion of (1-q)^k/Product_{j=1..k} (1-q^j) for k=12.at n=40A275643
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+19395) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=9A283886
• Number T(n,k) of reduced decompositions for all permutations of [n] with exactly k inversions; triangle T(n,k), n>=0, 0<=k<=n*(n-1)/2, read by rows.at n=35A289778