109926domain: NAppears in sequencesTruncated tetrahedral numbers: a(n) = (1/6)*(n+1)*(23*n^2 + 19*n + 6).at n=30A005906Sum of the divisors of 3^n+1.at n=10A366578Sum of the divisors of 9^n+1.at n=5A366666Number of subsets of {1,2,...,n} such that no two elements differ by 2, 3, or 5.at n=33A375982