18447

Appears in sequences

• Triangle of central factorial numbers 4^k T(2n+1, 2n+1-2k).at n=23A008958
• Trajectory of 3 under map x->x + (x-with-digits-reversed).at n=11A033648
• Trajectory of 15 under map x->x + (x-with-digits-reversed).at n=8A033653
• Trajectory of 21 under map x->x + (x-with-digits-reversed).at n=9A033656
• Trajectory of 69 under map x->x + (x-with-digits-reversed).at n=6A033672
• Partial sums of A051880.at n=8A050406
• a(n) = C(n)*(6*n + 1) where C(n) = Catalan numbers (A000108).at n=7A050476
• Partial sums of A050484.at n=7A052255
• Numbers n for which there are exactly twelve k such that n = k + reverse(k).at n=15A072435
• A 2nd order recursion: a(1)=a(2)=1, a(n) = prime(a(n-2)) + pi(a(n-1)) = A000040(a(n-2)) + A000720(a(n-1)).at n=14A082095
• Eighth column of (1,5)-Pascal triangle A096940.at n=8A096945
• Row sums of triangle A132819.at n=7A132820
• Triangle of scaled central factorial numbers, T(n,k) = A008958(n,n-k).at n=25A160562
• a(n) = n*(n-1)*(2*n+1)*(2*n-1)*(2*n-3)*(10*n-17)/90.at n=6A185375
• Number of (w,x,y) with all terms in {0,...,n} and w != max(|w-x|,|x-y|,|y-w|).at n=26A213498
• The subsequence A253071(2^n-1).at n=7A253072
• Product of sexagesimal digits of Fibonacci numbers in base-60 representation.at n=26A261598
• E.g.f.: S(x,q) = Integral C(x,q) * C(q*x,q) dx, such that C(x,q)^2 - S(x,q)^2 = 1, where S(x,q) = Sum_{n>=0} sum_{k=0..n*(n+1)/2} T(n,k)*x^n*y^k/n!, as an irregular triangle of coefficients T(n,k) read by rows.at n=43A322219