419328

Appears in sequences

• a(n) = a(n-1) - (n-1)*a(n-2), with a(0) = 1, a(1) = 2.at n=18A121966
• a(n) = product{k=1 to n} (k-th integer from among those positive integers which are coprime to (n+1-k)).at n=7A130767
• Triangle T, read by rows, where column 0 of T^m = {C(m*2^n, n), n>=0} for all m.at n=17A136470
• Modified linear phone booth sequence: number of ways to occupy n phone booths in a row, one by one, each time picking a phone booth adjacent to the smallest number of previously occupied phone booths.at n=10A192008
• Prime shadows of colossally abundant numbers, A004490.at n=22A353561
• a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2*k,2*n-4*k).at n=17A387762