Bell Number

This is Aitken's array as follows:
1
1 2
2 3 5
5 7 10 15
15 20 27 37 52
Algorithms:
2 = 1 + 1 ( 1 types of elements for helium)
2 = 1 * 2 ( 2 types of elements for Hydrogen)
10 = 1 + 1 + 2 + 5 (4 types of elements for Ammonia)
10 = 2 + 3 + 5 (3 types of elements for Water)
22 = 5 + 7 + 10(1 type of element for Titanium)(Because of Curve)
24 = 1 + 1 + 2 + 5 + 15( 5 types of elements for Formic Acid)
79 = 15 + 27 + 37(1 type of element for Gold)(Because of Curve)