47280

Appears in sequences

• Moebius transform of numbers of preferential arrangements.at n=8A006936
• Numbers k such that 7*10^k - 9 is prime.at n=30A103048
• Positive integer averages of first n Pell numbers; Sum{k=0..n-1} A000129(k) / n where n is in A270342.at n=8A270359
• a(n) = 3*2*1 + 6*5*4 + 9*8*7 + 12*11*10 + ... + (up to the n-th term).at n=27A319867
• Number of permutations of [n] with no fixed points where the maximal displacement of an element equals three.at n=10A321049
• Number of distinct regions among all circles that can be constructed on vertices of an n-sided regular polygon, using only a compass.at n=23A359046
• Array read by downward antidiagonals: A(n,k) = A(n-1,k+1) + 2*(k+1)!*Sum_{j=0..k} A(n-1,j)/j! with A(0,k) = 2*(k+1)!, n >= 0, k >= 0.at n=18A379459