18708

Appears in sequences

• Numbers having four 4's in base 8.at n=14A043440
• a(n) = Sum_{i=1..n} LookAndSay(i).at n=26A079664
• Index of first occurrence of n in A165633.at n=21A165765
• T(n,k)=Number of nXk binary matrices with no initial bit string in any row or column divisible by 6.at n=49A181039
• T(n,k)=Number of nXk binary matrices with no initial bit string in any row or column divisible by 6.at n=50A181039
• Number of nX(n+1) binary matrices with no initial bit string in any row or column divisible by 6.at n=4A181040
• T(n,k)=Number of nXk binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.at n=47A228796
• Number of 3 X n binary arrays with top left element equal to 1 and no two ones adjacent horizontally or nw-se.at n=7A228798
• Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.at n=4A251841
• Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.at n=3A251842
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.at n=31A251845
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime.at n=32A251845
• Numbers missing from A001033 despite satisfying the necessary congruence conditions (see comments).at n=27A274470
• G.f. A(x) satisfies A(x) = 1 + x * A(x)^4 * (1 + 2 * A(x)).at n=4A336572
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Sum_{j=0..n} 2^j * binomial(n,j) * binomial(k*n+j+1,n)/(k*n+j+1).at n=40A336574
• a(n) = Sum_{k=0..n} 2^k * binomial(n,k) * binomial(n^2+k+1,n)/(n^2+k+1).at n=4A336577
• Numbers k that are the maximum of integers |k2|, |k3|, |k5| with |k2| + |k3| + |k5| > 0, and |k2*sqrt(2) + k3*sqrt(3) + k5*sqrt(5)| is smaller than for any smaller value of k.at n=15A379919
• a(n) = 2*a(n-1) + 2*a(n-2) + 2*a(n-3) - a(n-4) with a(0)=0, a(1)=1, a(2)=4, a(3)=11.at n=10A387018