A246534 - cp's OEIS frontend

A246534 a(n) = Sum_{k=1..n} 2^(T(k)-1), where T(k)=k(k+1)/2 = A000217(k).

n	a(n)
0	0
1	1
2	5
3	37
4	549
5	16933
6	1065509
7	135283237
8	34495021605
9	17626681066021
10	18032025190548005
11	36911520172609651237
12	151152638972001256489509
13	1238091191924352276155613733
14	20283647694843594776223406899749
15	664634281540152780046679753547072037

[0, 1, 5, 37, 549, 16933, 1065509, 135283237, 34495021605, 17626681066021, 18032025190548005, 36911520172609651237, 151152638972001256489509, 1238091191924352276155613733, 20283647694843594776223406899749, 664634281540152780046679753547072037]

cp's OEIS Frontend

A246534 a(n) = Sum_{k=1..n} 2^(T(k)-1), where T(k)=k(k+1)/2 = A000217(k).

Table of values

List of values