19225

Appears in sequences

• Number of partitions of n into distinct parts with 3 levels of parentheses.at n=13A050344
• Coefficient triangle of polynomials (rising powers) related to Fibonacci convolutions. Companion triangle to A057995.at n=19A057280
• Coefficient triangle of polynomials (falling powers) related to Fibonacci convolutions. Companion triangle to A057281.at n=16A057282
• a(n) = 1 + n + n[n/2] + n[n/2][n/3] +... + n[n/2][n/3]...[n/n], where [x]=ceiling(x).at n=9A075887
• Numbers n such that n!*3^n - 1 is prime.at n=15A121859
• Sum of a positive square and a positive cube in at least three ways.at n=33A171385
• Free polyominoes with 4n squares, having 90-degree rotational symmetry about a square corner, but not having reflective symmetry.at n=9A234007
• Main diagonal of Ludic array A255127 (and A255129): a(n) = A255127(n,n).at n=23A255410
• The number of sets of parallel planes into which the planes defined in A270578 fall.at n=4A270579
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + 2*b(n-1) - b(n-2) - 2, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=17A294426
• Number of unitary factorizations of Heinz numbers of integer partitions of n. Number of multiset partitions of integer partitions of n with pairwise disjoint blocks.at n=23A305106
• Bitwise XOR of trajectories (centrally aligned) of rule 30, and its mirror image, rule 86, when both are started from a lone 1-bit, with the latter delayed by one step: a(n) = A110240(n) XOR 2*A265281(n-1).at n=6A327976
• a(n) = Sum_{1 <= i, j <= n} gcd(i, j, n)^3.at n=24A368743