21016

Appears in sequences

• Triangle of up-down sums of k-th powers: a(n,k)=sum(i^k,i=1..n)+sum((n-i)^k,i=1..n-1), n,k>0.at n=51A051672
• Number of binary strings of length n with equal numbers of 00001 and 01000 substrings.at n=15A164197
• Numbers n such that phi(n)=phi(n+5), with Euler's totient function phi=A000010.at n=5A179187
• Number of (n+1) X 2 0..3 arrays with every 2 x 2 subblock summing to 6.at n=5A183634
• Number of (n+1) X 7 0..3 arrays with every 2 X 2 subblock summing to 6.at n=0A183639
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to 6.at n=15A183642
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to 6.at n=20A183642
• Beach-Williams Pell numbers of type k^2 + 1.at n=16A212082
• T(n,k)=Number of nXk 0..3 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope.at n=29A223066
• T(n,k)=Number of nXk 0..3 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope.at n=34A223066
• Number of binary words of length n with exactly one occurrence of the subword given by the binary expansion of n.at n=16A229905
• Floor of sums of the non-integer fourth roots of n, as partitioned by the integer roots: floor(Sum_{j=n^4+1..(n+1)^4-1} j^(1/4)).at n=8A248698
• Those terms of A255571 whose every A080541/A080542-rotation is also a term of A255571.at n=38A258001