260130

Appears in sequences

• a(n) = 2*(3*n)! / ((2*n+1)!*(n+1)!).at n=10A000139
• Dodecahedral numbers: a(n) = n*(3*n - 1)*(3*n - 2)/2.at n=39A006566
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 34.at n=29A031712
• Array read by antidiagonals: T(r,n) = number of two-stack sortable r-permutations.at n=54A093346
• a(n) = 900*n^2 + 30.at n=17A158672
• a(n) = (32*n^3 - 2*n)/3.at n=29A267031
• a(n) = (5*n + 5)*(5*n + 6)*(5*n + 7)/6.at n=22A300523
• Square array A(m,k) is the number of unicyclic graphs with m trees of k nodes; m,k >= 0, read by falling antidiagonals.at n=69A338859
• a(n) = A000292(6*n + 1) where A000292 are the tetrahedral numbers.at n=19A349682
• Products of 6 distinct primes that are sandwiched between semiprime numbers.at n=35A378627