183790

Appears in sequences

• Number of permutations of 1..n with the sum of squared adjacent differences <= (n-1)*n*(n+1)/6.at n=7A180072
• Square array: T(n,k) = ((3^(n+1) + 1)^(k-1) + 2)/3, read by descending antidiagonals.at n=17A374258