183141

Appears in sequences

• a(n) = number of (s(0), s(1), ..., s(2*n-1)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 2, s(2*n-1) = 7. Also a(n) = T(2*n-1,n-3), where T is the array defined in A026009.at n=8A026018
• Partial sums of A051836.at n=16A051923
• G.f.: A(x) = A_1 where A_1 = 1/[1 - x*(A_2)^3], A_2 = 1/[1 - x^2*(A_3)^3], A_3 = 1/[1 - x^3*(A_4)^3], ... A_n = 1/[1 - x^n*(A_{n+1})^3] for n>=1.at n=16A132334
• Numbers k such that k' = concat(s,t) and k = s*t, where k' is the arithmetic derivative of k.at n=8A272780
• Numbers k such that k + A224787(k) is a square.at n=41A386640