35999900domain: NAppears in sequencesNumber of (3,n)-partitions of a chain of length n^2.at n=25A055658p*(p+1)*(p+2)/6 where (p,p+2) are twin primes.at n=26A126249Tetrahedral numbers k*(k+1)*(k+2)/6 such that exactly two of k, k+1, and k+2 are prime.at n=28A152916