3087000

Appears in sequences

• 4th power of the lower triangular normalized partition matrix.at n=20A027518
• First diagonal of A027518.at n=5A027525
• Triangle: Newton expansion of C(n,m)^4, read by rows.at n=48A262705
• Irregular table: T(n,k) equals the number of alignments of length k of n strings each of length 3.at n=18A299041
• Numbers k such that both k and sigma(k)=A000203(k) are powerful, i.e., are terms of A001694.at n=13A337044
• Indecomposable sigma-powerful numbers: powerful numbers k such that sigma(k) is also powerful, but restricted to terms that are not the product of 2 terms > 1 of A337044.at n=9A337045
• a(n) is the square of the side length of a simplex whose n-dimensional inner hypervolume is equal to its (n-1)-dimensional surface hypervolume. As a result, the sequence starts at n=2.at n=33A364922
• Triangle read by rows, Lah numbers with level 3.at n=33A390434