Can you guess the hidden meaning?

1
23
4567
8
9 10 11 12 13
14 15 16 17 18 19.......20

21
22 23 24 25
Twenty six
27 28
29

..................................................Thirty..................................................

31 32 33 34
Thirty...five
36 37 38 39 40

41 42 43
44
45 46
47 48 49...................................Fifty........................................