121485
domain: N
Appears in sequences
- a(n) = 1^2 + 3^2 + 5^2 + 7^2 + ... + (2*n-1)^2 = n*(4*n^2 - 1)/3.at n=45A000447
- Binomial coefficient C(7n,n-10).at n=3A004378
- Number of nodes in regular n-gon with all diagonals drawn.at n=43A007569
- Odd tetrahedral numbers: a(n) = (4*n+1)*(4*n+2)*(4*n+3)/6.at n=22A015219
- Binomial coefficients C(n,88).at n=3A017752
- Binomial coefficients C(91,n).at n=3A017807
- Number of (3,n)-partitions of a chain of length n^2.at n=10A055658
- Squarefree tetrahedral numbers.at n=26A070755
- Jacobsthal(n)*Fibonacci(n-1).at n=12A093043
- a(n) = n*(n-1)*(n-2)*(n-3)*(n^2-3*n-2)/48.at n=15A093566
- a(n) = floor(n^(3/2))*floor(1 + n^(3/2))*floor(2 + n^(3/2))/6.at n=19A185592
- a(n) = binomial(3*n + 1,3).at n=29A228887
- Number of ways to choose three points on a centered hexagonal grid of size n.at n=5A240826
- Number of 4-member subsets of [4*n] whose elements sum to a multiple of n.at n=23A318625
- Squarefree tetrahedral numbers which are products of five distinct primes.at n=3A354976
- Odd numbers k that are closer to being perfect than previous terms and also satisfy the condition that A324644(k)/A324198(k) = 2.at n=9A386422