20171

Appears in sequences

• Rectangular table, read by antidiagonals, where row n is equal to column 0 of matrix power A121412^(n+1) for n>=0.at n=50A121424
• Number of subpartitions of partition P=[0,1,1,2,2,2,3,3,3,3,4,...] (A003056).at n=19A121430
• a(1) = 1; a(n+1) = round(sqrt(3)*a(n)).at n=18A134009
• Square array, read by antidiagonals, where T(n,k) = T(n,k-1) + T(n-1,k+n) for n>0, k>0, such that T(n,0) = T(n-1,n) for n>0 with T(0,k)=1 for k>=0.at n=49A136733
• a(n) = 12*n^2 - 1.at n=41A158463
• Positive integers of the form (30*m^2+1)/11.at n=15A179339