53628

Appears in sequences

• Number of achiral trees with n nodes.at n=22A005629
• Euler transform of numbers of preferential arrangements.at n=7A007003
• Sides of integer Heronian triangles [A068967(n), prime(A068967(n)), a(n)] with area A068969(n).at n=28A068968
• Triangular numbers m such that A040115(m) is also triangular.at n=25A087597
• Number T(n,k) of inequivalent n X n matrices using exactly k different symbols, where equivalence means permutations of rows or columns or the symbol set; triangle T(n,k), n>=0, 0<=k<=n^2, read by rows.at n=29A242106
• Partial sums of A299257.at n=41A299263
• Number of regions in an equal-armed cross with arms of length n (see Comments for definition).at n=8A331456
• Positive triangular numbers such that the two numbers before it and the two numbers after it are squarefree.at n=40A374503
• Semiperimeter of the unique primitive Pythagorean triple whose inradius is the n-th prime and whose short leg is an odd number.at n=37A382070
• First component A of the pairs (A, B), listed in increasing order, such that the multiset of digits of A union the multiset of digits of B equals the multiset of digits of A^2 and the multiset of digits of B^2, for some B >= A. Note that terms may be repeated.at n=20A389379
• Second component B of the pairs (A, B) from A389379.at n=12A389390