240241

Appears in sequences

• Lucky numbers that are decimal concatenations of n with n + 1.at n=22A032651
• Number of n X 3 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.at n=4A232290
• T(n,k)=Number of nXk 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.at n=25A232295
• Number of 5Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally.at n=2A232299
• a(n) = n! * Sum_{d|n} binomial(n-1,d-1) / d!.at n=7A329966