26538

Appears in sequences

• Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,39.at n=6A064256
• Number of connected labeled 4-colorable (i.e., chromatic number <= 4) graphs on n nodes.at n=5A084284
• Number of (3412,1234)-avoiding involutions in S_n.at n=33A085583
• Number of (-1,0,1) polynomials of degree-n irreducible over the integers.at n=9A087610
• Number of length 2+2 0..n arrays with the sum of the maximum minus the median of adjacent triples multiplied by some arrangement of +-1 equal to zero.at n=16A251936