A353921 - cp's OEIS frontend

A353921 a(n) = n if n < 4, otherwise floor(abs(z(n))) where z(n) = (2^(2n + 1/2) - 1)(4n + 1)zeta(1/2 - 2*n).

n	a(n)
0	0
1	1
2	2
3	3
4	20
5	202
6	2953
7	58574
8	1517830
9	49788988
10	2016610506
11	98842394546
12	5766037456673
13	394787840828770
14	31350291022336674
15	2858009622374873775
16	296454369597967332107
17	34715387135986234970960
18	4557676382296459474148951
19	666708107998151285537770827

[0, 1, 2, 3, 20, 202, 2953, 58574, 1517830, 49788988, 2016610506, 98842394546, 5766037456673, 394787840828770, 31350291022336674, 2858009622374873775, 296454369597967332107, 34715387135986234970960, 4557676382296459474148951, 666708107998151285537770827]

cp's OEIS Frontend

A353921 a(n) = n if n < 4, otherwise floor(abs(z(n))) where z(n) = (2^(2n + 1/2) - 1)(4n + 1)zeta(1/2 - 2*n).

Table of values

List of values

cp's OEIS Frontend

A353921 a(n) = n if n < 4, otherwise floor(abs(z(n))) where z(n) = (2^(2*n + 1/2) - 1)*(4*n + 1)*zeta(1/2 - 2*n).

Table of values

List of values

A353921 a(n) = n if n < 4, otherwise floor(abs(z(n))) where z(n) = (2^(2n + 1/2) - 1)(4n + 1)zeta(1/2 - 2*n).