71253

Appears in sequences

• Degrees of irreducible representations of Rudvalis group Ru.at n=23A003918
• Alkane (or paraffin) numbers l(8,n).at n=25A005995
• Number of reversible strings with n-1 beads of 2 colors. 5 beads are black. String is not palindromic.at n=24A032092
• a(n) = binomial(Fibonacci(n) + 1, 2).at n=14A033192
• Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n*(n+1)*(n-1)*(n-2)/8.at n=28A050534
• One half of binomial coefficients C(2*n-4,5).at n=12A053132
• Triangle read by rows: T(n,k) = binomial(3n+3, k)*(n-k+1)/(n+1).at n=50A064282
• Triangular numbers such that the product of digits is also a (positive) triangular number.at n=21A069077
• Numbers k divisible by at least one nontrivial permutation (rearrangement) of the digits of k, excluding all permutations that result in digit loss.at n=15A090056
• Triangular numbers for which the sum of the digits equals the sum of the digits of the next triangular number.at n=17A117511
• a(n)*a(n-11) = a(n-1)*a(n-10)+a(n-5)+a(n-6) with initial terms a(1)=...=a(11)=1.at n=34A133848
• Indices of the start of 10 successive distinct digits in the decimal expansion of e (2.718281828...).at n=35A258166
• Number of n-element subsets of [n+5] having an even sum.at n=25A282081
• Number of nonisomorphic unfoldings in an n-gonal Archimedean antiprism.at n=7A284647
• G.f. A(x) = Sum_{n>=0} x^n/a(n) satisfies: A(x) = A(x^2) + Integral A(x^2) dx.at n=117A294640
• 32*a(n) is the denominator of the squared circumradius of a cyclic quadrilateral with sides n, n+1, n+2, n+3.at n=25A351697