270725
domain: N
Appears in sequences
- Binomial coefficient C(4n,n-9).at n=4A004339
- Binomial coefficient C(n,48).at n=4A011001
- Binomial coefficients C(52,n).at n=4A017768
- Binomial coefficients C(2*n+4,4).at n=24A053134
- a(n) = binomial(4*n,4).at n=12A060541
- Pentagonal numbers (A000326) that are the product of 2 palindromes greater than 1.at n=29A115745
- Triangle, read by rows, where T(n,k) = C(C(n+2,3) - C(k+2,3), n-k) for n >= k >= 0.at n=23A126445
- Column 2 of triangle A126445; a(n) = C( C(n+4,3) - 4, n).at n=4A126448
- a(n) = denominator of Product_{k=1..n} (1 + {n/k}), where {x} is the fractional part of x, {x} = x - floor(x).at n=17A128779
- List of numbers that are both pentagonal (A000326) and binomial coefficients C(n,4) (A000332).at n=33A145920
- Degrees of irreducible representations of simple Chevalley group F4(2).at n=25A214481
- Doubly pentagonal numbers: a(n) = n*(3*n-2)*(3*n-1)*(3*n+1)/8.at n=17A232713
- a(n) = A239793(n)/2^(3*n).at n=24A239795
- Numbers n such that (6n-1, 6n+1), (12n-1, 12n+1) and (18n-1, 18n+1) are 3 pairs of twin primes.at n=4A290811
- Pentagonal numbers (A000326) in which parity of digits alternates.at n=34A297644
- a(n) = denominator(4^n * n! * [x^n] sqrt(x / (e^x - 1))).at n=48A365671