72130

Appears in sequences

• a(n) = Sum_{k=floor((n+1)/2)..n} T(k,n-k); i.e., a(n) is n-th diagonal sum of left-justified array T given by A027011.at n=26A027022
• Square root of a(n) contains the n-th Fibonacci number as a string of digits to the immediate right of the decimal point (excluding leading zeros).at n=33A099401
• Numbers k such that binomial(4k, k) + 1 is prime.at n=35A125241
• Number of (n+2) X 5 0..1 matrices with each 3 X 3 subblock idempotent.at n=19A224554