129129

Appears in sequences

• Lucky numbers that are concatenations of a number k with itself.at n=16A032650
• Odd numbers divisible by the palindromic sum of their prime factors (counted with multiplicity).at n=25A046359
• Number T(n,k) of 2n-length strings of balanced parentheses of exactly k different types that are introduced in ascending order; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=31A253180
• Number of 2n-length strings of balanced parentheses of exactly 3 different types that are introduced in ascending order.at n=4A258391
• Number of nX4 binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.at n=6A267241
• T(n,k)=Number of nXk binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.at n=51A267245
• Number of 7Xn binary arrays with row sums nondecreasing and columns lexicographically nondecreasing.at n=3A267250
• Expansion of e.g.f. exp(x^5/120 * cosh(x)).at n=15A389242