Write Python code to display the first ten terms of the following series:

1, 2, 4, 7, 11, ……………

Write Python code to display the first ten terms of the following series:

2, 5, 10, 17, ……………

Design Python code to find and display the sum of the following series:

s = (1*2) + (2*3) + …………… + (19*20)

Write Python code to find the sum of the given series:

1 + (1+2) + (1+2+3) + …………… + (1+2+3+……………+n)