20654

Appears in sequences

• Number of self-avoiding walks of length n from origin in strip Z X {0,1}.at n=18A038577
• a(n) = floor( e^((n/2)*arccosh(1+sqrt(2))) ).at n=13A093698
• a(n) = if n mod 2 = 0 then 8*F(n)-n otherwise 8*F(n)-4, where F() = Fibonacci numbers A000045.at n=18A110935
• Numbers n such that sigma(n) and sigma(sigma(n)) are both perfect squares.at n=23A134263
• Number of strict partitions of 2n having 1 more even part than odd, so that there is at least one ordering of the parts in which the even and odd parts alternate, and the first and last terms are even.at n=44A239872
• Sum of the sixth largest parts of the partitions of n into 9 parts.at n=45A326468