19845

Appears in sequences

• Successive denominators of Wallis's approximation to Pi/2 (reduced).at n=9A001902
• Number of noncommutative SL(2,C)-invariants of degree n in 5 variables.at n=10A007043
• "BIK" (reversible, indistinct, unlabeled) transform of 2,2,2,2...at n=9A032124
• Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=17A046320
• Let G_n be the elementary Abelian group G_n = (C_3)^n; a(n) is the number of times the number 1 appears in the character table of G_n.at n=4A061253
• Number of strings over Z_3 of length n with trace 0 and subtrace 0.at n=10A073947
• Number of strings over Z_3 of length n with trace 1 and subtrace 1.at n=10A073951
• Number of elements of GF(3^n) with trace 0 and subtrace 0.at n=10A074000
• Number of elements of GF(3^n) with trace 1 and subtrace 1.at n=10A074004
• First differences of triangular numbers with square pyramidal indices.at n=8A077538
• a(n) = (n-1)*(n-2)*(n-3)*(3*n-10)*3^(n-5)/4.at n=7A086864
• Terms in A112039 that are divisible by 3, divided by 3.at n=30A112040
• Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k leaves (i.e., vertices of degree 0; n>=0, k>=1). A ternary tree is a rooted tree in which each vertex has at most three children and each child of a vertex is designated as its left or middle or right child.at n=21A120429
• Expansion of (2*x-1)*(x-1)*x / ((3*x-1)*(3*x^2-1)).at n=10A122008
• Numerators of sequence of fractions with e.g.f. (1+x)/(1-x)^(3/2).at n=5A126119
• A certain partition array in Abramowitz-Stegun order (A-St order).at n=33A134144
• Partition number array, called M32(-3), related to A000369(n,m) = |S2(-3;n,m)| (generalized Stirling triangle).at n=36A143173
• Numbers with exactly 3 distinct odd prime divisors {3,5,7}.at n=20A147576
• Array A(n, k) = Product_{j=1..n} Product_{i=1..j} (1 - (k+1)^i)/(1 - (k+1))^j, with A(n, k) = n!, read by antidiagonals.at n=19A156953
• Triangular sequence from coefficients of the polynomial recursion: p(x,n)=Sum[Binomial[n, m]*p[x, m]*p[x, n - m - 1], {m, 0, n - 1}].at n=16A157526