54656

Appears in sequences

• a(n) = (5*n^2 + 1)*n^2 / 6.at n=16A008354
• a(n) = (5*4^n + (-2)^n)/6.at n=8A083424
• Number of subsets of {1..n} (including empty set) such that the pairwise LCMs of elements are all distinct.at n=21A196721
• Numbers whose Schwarzian arithmetic derivative is an integer.at n=41A209872
• Number of representations of n as a sum of products of pairs of positive integers, n = Sum_{k=1..m} i_k*j_k with i_k<=j_k, i_k<=i_{k+1}, j_k<=j_{k+1}, i_k*j_k<=i_{k+1}*j_{k+1}.at n=40A212214
• Numbers appearing in A245180.at n=49A245181
• Number of (6+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=7A252538
• Number of loop-graphical integer partitions of 2n.at n=23A339656
• Number of different multisets that can be obtained by choosing a prime index (or a prime factor) of each integer from 2 to n.at n=49A355746