163878

Appears in sequences

• a(1) =a(2) =1. a(n+1) = (sum{1<=k<=n/2} a(k)) * (sum{n/2<j<=n} a(j)).at n=10A113844
• Number of n X 6 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=8A209648
• Number of simple connected graphs with n nodes that have no subgraph isomorphic to the bowtie graph or K_4.at n=9A243551
• Number of n X 3 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.at n=5A268634
• Number of nX6 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.at n=2A268637
• T(n,k)=Number of nXk 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.at n=30A268639
• T(n,k)=Number of nXk 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two exactly once.at n=33A268639
• Triangular numbers which are products of five distinct primes.at n=38A357590