A006898 - cp's OEIS frontend

A006898 a(n) = Sum_{k=0..n} C(n,k)2^(k(k+1)/2).

n	a(n)
0	1
1	3
2	13
3	95
4	1337
5	38619
6	2310533
7	283841911
8	70927591153
9	35812691480115
10	36383765777442685
11	74185239630793429775
12	303119284294591169426729
13	2479814853198140771706795531
14	40599509058360322571947638063605

[1, 3, 13, 95, 1337, 38619, 2310533, 283841911, 70927591153, 35812691480115, 36383765777442685, 74185239630793429775, 303119284294591169426729, 2479814853198140771706795531, 40599509058360322571947638063605]

cp's OEIS Frontend

A006898 a(n) = Sum_{k=0..n} C(n,k)2^(k(k+1)/2).

Table of values

List of values

cp's OEIS Frontend

A006898 a(n) = Sum_{k=0..n} C(n,k)*2^(k*(k+1)/2).

Table of values

List of values

A006898 a(n) = Sum_{k=0..n} C(n,k)2^(k(k+1)/2).