37968

Appears in sequences

• E.g.f. sec(arctan(x)^2) (even powers only).at n=4A012466
• Array read by antidiagonals: T(k,d) = number of different hyperplanes in d-space with integer coefficients in set {-k,...,-1,0,1,...,k}.at n=26A061559
• Numbers occurring twice in A068627.at n=28A068628
• Number of 4 X n (0,1) matrices such that each row and each column is nondecreasing or nonincreasing.at n=13A086114
• a(n) = phi(Padovan(n+4)).at n=40A107797
• Number of ways to write n as an ordered sum of 1's, 2's and 3's such that no 2 precedes any 1.at n=26A124062
• A triangle of coefficients of a product polynomial sequence based on Chebyshev T[(x,n): p(x,n) = Product_{m=0..n} Sum_{i=0..m} T(x,i).at n=51A139808
• Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, up, up, up.at n=8A177530