67251

Appears in sequences

• a(n) is the number of distinct billiard words with length n on an alphabet of 3 symbols.at n=15A180238
• Number of (n+2) X 7 0..2 matrices with each 3 X 3 subblock idempotent.at n=16A224603
• Triangular array T read by rows: T(r,c) is the number of double permutations of the integers from 1 to r which have exactly c different values visible when viewed from the left, in the sense that a higher number hides a lower one.at n=26A309053
• a(n) is the result of n applications of the function f to n, where f(x) = floor((3*x + 1)/2) (A007494).at n=20A353220
• Square array A(n,k), n > 0, k > 0, read by downward antidiagonals: A(n,k) is the number of columns in all k-compositions of n.at n=40A382818
• Number of columns in all n-compositions of n.at n=4A382820