323400

Appears in sequences

• a(n) = n^2*(n+1)^2*(n+2)/12.at n=20A004302
• Triangle read by rows: T(n,k) is the number of partitions of [1, 2, ..., k] into exactly n blocks, each of size 1, 2 or 3 (n >= 0, 0 <= k <= 3n).at n=47A144385
• Triangle in A144385 with rows left-adjusted.at n=32A144399
• Numbers with prime factorization pqr^2s^2t^3.at n=14A190386
• Number of (w,x,y,z) with all terms in {1,...,n} and |x-y|>=|y-z|.at n=28A212682
• a(n) = 5*4*3*2*1 - 10*9*8*7*6 + 15*14*13*12*11 - 20*19*18*17*16 + ... - (up to the n-th term).at n=17A319888
• Integers y such that there exist two integers 0<x<=y<=z such that psi(x) = psi(y) = psi(z) = x + y + z.at n=8A386901
• Integers z such that there exist two integers 0<x<=y<=z such that psi(x) = psi(y) = psi(z) = x + y + z.at n=6A386933