38970

Appears in sequences

• Numbers k such that if you subtract k-reversed from k you get a natural number with the same digits as k.at n=11A121969
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is flat, i.e., with all blocks in parallel position.at n=8A123764
• Binomial transform of A012245 (characteristic function of factorial numbers).at n=20A143963
• Number of permutations of 1..n with both permutation and its inverse having exactly 5 maxima.at n=9A180395
• Number of 4-length words w over n-ary alphabet such that for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.at n=15A213283
• Array read by descending antidiagonals: A(n,k) is the number of oriented colorings of the facets of a regular n-dimensional orthotope using up to k colors.at n=50A325004