22194

Appears in sequences

• a(n) = Sum_{i=0..n} A047060(i,n-i).at n=16A047061
• Triangle read by rows: a(n, m) = S1(n, m)*3^(n-m), where S1 are the signed Stirling numbers of first kind A008275 (n >= 1, 1 <= m <= n).at n=16A051141
• Number of 2 X n matrices over GF(3) under row and column permutations.at n=10A052267
• Number of quasi-triominoes in an n X n bounding box.at n=19A094170
• Numbers n such that the sum of the digits of sigma(n)^phi(n) is divisible by n.at n=16A109669
• Smallest number requiring n steps to reach a prime under the "add a digit" process described in A241180.at n=9A241182
• Number of compositions of n into distinct parts with exactly two descents.at n=25A241721
• Composites whose prime factorization in base 5 is an anagram of the number in base 5.at n=13A260049
• a(n) = number of triangles that can be formed from the points of a 3 X n grid.at n=17A262402
• Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=3A300209
• Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=3A300211
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=24A300215
• Numbers k such that 427*2^k+1 is prime.at n=33A323114
• Number of maximal subsets of {1..n} containing no sums of distinct elements.at n=30A326498
• One-half of the number of lines through at least 2 points of an n X n grid of points.at n=21A331780
• Numbers k such that A008475(k)+1 = A008475(k+1).at n=31A333801
• Numbers k such that A181894(k)+1 = A181894(k+1).at n=25A333802
• Smallest number requiring n steps to reach a prime under the "add a digit" process described in A241181.at n=10A336382
• Number of subsets of {1..n} whose greatest element can be written as a (strictly) positive linear combination of the others.at n=35A365043
• Primitive practical numbers of the form 2 * 3^i * prime(k).at n=30A367481