10816624
domain: N
Appears in sequences
- a(n) = Sum_{j=0..n} A047072(j, n-j).at n=26A047073
- a(n) = 4*C(2n,n) - 3*0^n.at n=12A146534
- a(n) = 4*(2*n)! / (n!)^2.at n=12A240530
- Number of permutations of length n such that numbers at odd positions are monotone and numbers at even positions are also monotone.at n=24A257546
- Lexicographically earliest sequence such that for any n>1, n=u*v, where u/v = a(n)/a(n-1) in reduced form.at n=23A260850
- A260850 sorted into increasing order and duplicates omitted.at n=25A370974