26689
domain: N
Appears in sequences
- CATS sequence: cube-add-then-sort variation of RATS (reverse, add then sort) sequence.at n=39A079320
- Coefficients of 1/(1-2*x-7*x^2)^(1/2); also, a(n) is the central coefficient of (1+x+2*x^2)^n.at n=9A084601
- Number triangle T(n,k) = Sum_{j=0..n} C(n-k,j-k)*C(j,n-j)*2^(n-j).at n=45A115991
- Number of integers in n-th generation of tree T(-3/2) defined in Comments.at n=27A274154
- Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 6 or 8 king-move adjacent elements, with upper left element zero.at n=15A305477
- Number of subsets of {1..n} containing all of their integer quotients.at n=20A326023
- a(n) = A115004(2n)/4.at n=13A331760