The first few terms of this sequence are 1,1,2,4,10,26,76,232; these numbers are called the telephone numbers, and they also count the number of Young tableaux with a given number of cells.
The first few terms of this sequence are 1 2.1 2 is 4 26.4 26 is 76.76 is 232.4 is 10.1 is 1. These numbers are called the telephone numbers. They also count the number of Young tableaux with a given number of cells.