102904

Appears in sequences

• Number of nondecreasing arrangements of n+2 numbers in 0..n with the last equal to n and each after the second equal to the sum of one or two of the preceding three.at n=34A190034
• a(n) is the number of permutations of length n that avoid the pattern 321 and the mesh pattern (12, 171) or the same sequence for the mesh pattern (12, 426).at n=12A289591