31405

Appears in sequences

• Triangle T(n, k) read by rows; given by [1, 1, 1, 1, 1, ...] DELTA [1, 1, 2, 5, 14, 42, 132, 429, 1430, ...] (A000108) where DELTA is Deléham's operator defined in A084938.at n=37A085843
• a(n) = DP(n) is the total number of k-double-palindromes of n, where 2 <= k <= n.at n=21A180750
• Second column of the triangle A085843.at n=7A261048
• Expansion of Sum_{k>=2} x^Fibonacci(k)/(1 - x^Fibonacci(k)) / Product_{k>=2} (1 - x^Fibonacci(k)).at n=41A281689