19122

Appears in sequences

• Number of corners, or planar partitions of n with only one row and one column.at n=21A006330
• Triangle T(n,k), n >= 1, giving number of prime unoriented alternating links with n crossings and k components.at n=70A059739
• Numbers k such that 4^k + 3 is prime.at n=27A089437
• Numbers m such that Sum_{i=1..m} omega(i)^2 is divisible by m, where omega is A001221.at n=7A145191
• Partial sums of A005985.at n=11A176640
• Numbers n such that n''' = n''+ 1 where n'' and n''' are respectively the second and the third arithmetic derivative of n.at n=8A189941
• Expansion of f(-x^6)^3 / (f(-x^4)^2 * psi(x)) in powers of x where phi(), f() are Ramanujan theta functions.at n=44A262152
• Number of nX3 arrays containing 3 copies of 0..n-1 with every element equal to or 1 greater than any west or northeast neighbors modulo n and the upper left element equal to 0.at n=13A267737
• Number of n X 4 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=9A280550
• Number of integer partitions of n in which the even parts appear as often at even positions as at odd positions.at n=42A300787
• a(n) = 27*n^2 - 21*n + 6 (n>=1).at n=26A304164
• Number of n-node rooted trees of height equal to the number of internal (non-leaf) nodes.at n=14A358587