137480

Appears in sequences

• Triangle read by rows: T(n,k) is the number of ternary sequences of length n containing k subsequences 000 (consecutively; n,k>=0).at n=47A119825
• Number of ternary words of length n with no 000's.at n=11A119826
• Number of ways to place 3 nonattacking zebras on a 3 X n board.at n=31A172221
• Number of unlabeled trees on n nodes with maximum degree three and three vertices of degree three.at n=26A355024