19458

Appears in sequences

• a(0) = 1, a(n) = 19*n^2 + 2 for n>0.at n=32A010009
• Expansion of x/(1 - 6*x - 11*x^2).at n=6A015553
• Hypothetical numbers of terms in general expressions for coefficients of Lovelock Lagrangians.at n=9A045900
• Engel expansion of sinh(1/3).at n=23A068380
• a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A000984(k) = C(2*k,k) equals n.at n=28A081393
• a(n) is the smallest value of k such that number of non-unitary prime divisors of k-th Catalan number, A000108(k) = C(2*k,k)/(k+1) equals n.at n=27A081395
• Number of 5-way intersections in the interior of a regular 6n-gon.at n=46A137939
• Numbers n with property that 4 n^2 are squares arising in A158470.at n=38A158517
• a(n) = n*(3*n^2 + 6*n + 1).at n=18A196507
• Number of nX2 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors.at n=6A199224
• Number of nX7 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors.at n=1A199229
• T(n,k) = Number of n X k 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors.at n=29A199230
• T(n,k) = Number of n X k 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors.at n=34A199230
• Sum of first n squares of semiprimes.at n=18A217736
• The Wiener index of the nanostar dendrimer D_3[n] , defined pictorially in the Alikhani - Iranmanesh reference.at n=1A221008
• Number of nX5 0..1 arrays with no element equal to the same number of vertical neighbors as horizontal neighbors, with new values 0..1 introduced in row major order.at n=7A240646
• Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111.at n=9A260363
• Triples of practical numbers: numbers n such that n-2, n, n+2 are all practical numbers.at n=22A287682
• a(n) = Sum_{1 <= x_1 <= x_2 <= x_3 <= x_4 <= x_5 <= x_6 <= x_7 <= n} gcd(x_1, x_2, x_3 , x_4, x_5, x_6, x_7, n).at n=10A343521
• Numbers which are the sum of a prime and the square of the next prime.at n=32A349660