72905

Appears in sequences

• Sum along upward diagonal of Pascal triangle from center.at n=27A010757
• T(n, 2n-9), T given by A027926.at n=13A027932
• a(n) = T(2n,n+4), T given by A027948.at n=5A027952
• a(n) = greatest number in row n of array T given by A027948.at n=18A027957
• Number of rooted trees where any 2 subtrees extending from the same node have a different number of nodes.at n=17A032305
• Partial sums of A053308.at n=9A053309
• Numbers k such that k | sigma_7(k) - phi(k)^7.at n=25A055701
• a(n) = Sum_{i=0..n} binomial(2*n-i, n+i).at n=9A108081
• Least k such that k*6^n-1 , k*6^n+1, and 2*k*6^n-1 are prime; that is, twin primes and a Sophie Germain prime.at n=38A212481
• Number of linear chord diagrams having n chords and no chord length larger than five.at n=8A293997