20603

Appears in sequences

• Number of polyiamonds with n cells that tile the plane by translation or by 180-degree rotation (Conway criterion).at n=15A075221
• Multiples of 11 with digit sum 11, with no zero digits in odd places.at n=22A083512
• Numbers whose set of base 12 digits is {0,B}, where B base 12 = 11 base 10.at n=13A097258
• Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326).at n=27A115708
• Number of (n+1) X (4+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=4A250751
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=32A250755
• Number of (5+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=3A250760
• Numbers with digit sum 11 that are multiples of 11.at n=31A283742
• Numbers k such that (23*10^k - 47)/3 is prime.at n=20A293274
• Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=7A317454
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=58A317458
• Antidiagonal-sums of absolute value of the array A378622(n,k) = n-th term of k-th differences of strict partition numbers (A000009).at n=19A378971