40222

Appears in sequences

• a(n) = n*(11*n^2 - 5)/6.at n=28A004467
• Ordered product of the sides of primitive Pythagorean triangles divided by 60.at n=32A081752
• Difference between the square root of n-th square triangular number and n-th lambda number given by the recurrence f(n) = 2f(n-1) + f(n-2), f(1) = 1, f(2)= 2.at n=6A113450
• Catalan number analogs for A099927, the generalized binomial coefficients for Pell numbers (A000129).at n=4A256799
• Numbers k such that 6*R_k + 10^k - 5 is prime, where R_k = 11...11 is the repunit (A002275) of length k.at n=11A259118
• One half of numbers representable in at least two different ways as sums of four nonvanishing cubes. See A259060 for these numbers and their representations.at n=17A261241
• Number of even-length integer compositions of 2n whose half-alternating sum is 0.at n=10A357642
• a(n) = number of subsets of {1, 2, ..., n} that represent the first k divisors of m for some positive integers m and 1 <= k <= A000005(m).at n=34A378314