25820
domain: N
Appears in sequences
- Number of triangles in an n X n grid of squares with diagonals.at n=20A100583
- Numbers whose square starts with 4 identical digits.at n=26A132391
- Number of different strings of length n obtained from "abcd" by iteratively duplicating any substring.at n=13A137744
- Partial sums of A160410.at n=29A160799
- 1-Euler triangle.at n=47A188587
- 1-Euler triangle.at n=52A188587
- Number of (n+1) X (2+1) 0..1 arrays colored with the sum of the upper and lower median values of each 2 X 2 subblock.at n=16A236324
- Sum of the sizes of the ninth blocks in all set partitions of {1,2,...,n}.at n=3A270501
- a(n) = a(n-1) + a(n-3) + 2*a(n-5) - a(n-8) - a(n-10), n > 10.at n=20A293344
- Sum of the largest parts in the partitions of n into 7 squarefree parts.at n=50A308960
- a(n) = Sum_{d|n} mu(n/d) * binomial(d,4).at n=29A346761
- Numbers whose square starts with exactly 4 identical digits.at n=25A346940