40100

Appears in sequences

• Coordination sequence for {A_4}* lattice.at n=20A008531
• Number of ways to partition n elements into pie slices of different sizes.at n=36A032153
• Łukasiewicz word for each rooted plane tree (interpretation e in Stanley's exercise 19) encoded by A014486 (or A063171), with the last leaf implicit, i.e., these words are given without the last trailing zero, except for the null tree which is encoded as 0.at n=28A071153
• Number of single nodes (exactly one node on that level) for all Motzkin paths of length n.at n=14A088457
• Numbers k such that k and k^2 use only the digits 0, 1, 4, 6 and 8.at n=51A136861
• Numbers of the form prime(n)*(prime(n)-1)/4.at n=37A171555
• Sequence A261220 shown in factorial base: a(n) = A007623(A261220(n)).at n=58A260743
• Number of integers in n-th generation of tree T(-3/2) defined in Comments.at n=28A274154
• a(n) = (1/12)*n^2*(3*(1 + n^2) - 2*(2 + n^2)*(n mod 2)).at n=20A322844
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, formed inside a right triangle by the straight line segments mutually connecting all vertices and points on the two shorter edges whose positions on one edge equal the Farey series of order n while on the other they divide its length into n equal segments.at n=45A359977
• Number of integer compositions of n in which runs of 1's all have length <= 1, runs of 2's all have length <= 2, runs of 3's all have length <= 3, etc.at n=19A389510