63991

Appears in sequences

• Number of connected ordered 4-element multiantichains on a labeled n-set.at n=5A094731
• Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 8 which is flat, i.e., with all blocks in parallel position, and symmetric after a rotation by 180 degrees.at n=8A123813
• Integers k such that k + 1 has a divisor that is an anagram of k, which must have the same number of digits as k.at n=23A384597