23008

Appears in sequences

• Triangle read by rows: T(n,k) is the number of unlabeled nonseparable (or 2-connected) loopless multigraphs with n edges on k nodes and degree >= 3 at each node, n >= 3, 2 <= k <= floor(2*n/3).at n=56A046752
• Sum of squares of entries of Wilkinson's eigenvalue test matrix of order 2n+1.at n=32A059834
• a(n) = Hermite(n,4).at n=5A144143
• The 5th Hermite Polynomial evaluated at n: H_5(n) = 32*n^5 - 160*n^3 + 120*n.at n=4A247850
• Integers which can be written in exactly three ways as sum of two distinct nonzero pentagonal numbers.at n=24A333013
• Numbers k such that A048673(k) divides 1+A003973(k).at n=4A337342
• Triangular array read by rows. T(n, k) is the coefficient of x^k in a(n+3) where a(1) = a(2) = a(3) = 1 and a(m+2) = (m*x + 2)*a(m+1) - a(m) for all m in Z.at n=32A358735
• Irregular triangle read by rows: T(n,k) is the number of polyominoes of size k, i.e., connected subsets of k square cells (or vertices), of the n X n flat torus, up to cyclic shifts and reflections of rows and columns; 1 <= k <= n^2.at n=44A385383
• a(n) is the number of 4 element sets of distinct integer sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units.at n=48A389392