20686

Appears in sequences

• G.f.: exp( Sum_{n>=1} A068963(n)*x^n/n ) where A068963(n) = Sum_{d|n} phi(d^3).at n=13A226106
• Length of n-th iterate of the mapping 00->0010, 01->001, 10->001, starting with 00.at n=17A289000
• Length of n-th iterate of the mapping 00->0010, 10->010, 1-->001, starting with 00.at n=17A289028
• Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=4A302316
• Number of nX5 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=4A302319
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=40A302322
• Number of 5Xn 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=4A302326
• Total number of occurrences of 6 in the (signed) displacement sets of all permutations of [n+6] divided by 6!.at n=5A324356
• a(n) is the Wiener index of a tridon on n vertices.at n=45A349418
• The internal state of the Sinclair ZX81 and Spectrum random number generator.at n=38A357907
• Number of integer partitions of n that are neither Look-and-Say nor section-sum.at n=38A383510