19854

Appears in sequences

• Numbers n such that 3*10^n + 8*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=18A102980
• Number of ways to place 3 nonattacking bishops on a 3 X n board.at n=17A172207
• Number of (w,x,y,z) with all terms in {0,...,n} and at least one of these conditions holds: w<R, x<R, y<R, z>R, where R=max{w,x,y,z}-min{w,x,y,z}.at n=11A212752
• G.f.: x^2*(1-2*x)/(1-8*x+22*x^2-26*x^3+14*x^4-5*x^5+x^6).at n=9A256428
• Square array A(1,k) = A265907(k), A(n>1,k) = A(n-1, k+1) - A(n-1, k); successive differences of A265907 read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...at n=18A275960
• Transpose of array A275960.at n=17A275961
• Number of n X n 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.at n=3A278318
• Number of nX4 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.at n=3A278321
• T(n,k)=Number of nXk 0..1 arrays with rows and columns in lexicographic nondecreasing order but with exactly two mistakes.at n=24A278325
• Indices of records in A370748.at n=54A371864