A339057 - cp's OEIS frontend

A339057 a(n) = (-1)^(n + 1)3^(2n + 1)Euler(2n + 1, 1/3)2^(valuation_{2}(2(n + 1))), the Steinhaus-Euler sequence S_{3}(n).

n	a(n)
0	1
1	13
2	121
3	18581
4	305071
5	61203943
6	4353296221
7	6669149100757
8	206772189255571
9	128970681211645873
10	24697503335329725121
11	45583359018138184284551
12	6235055851689626935206871
13	7982707567621372702411448803
14	2955418704408380517540605162821
15	40101878131071637461151318174173269

[1, 13, 121, 18581, 305071, 61203943, 4353296221, 6669149100757, 206772189255571, 128970681211645873, 24697503335329725121, 45583359018138184284551, 6235055851689626935206871, 7982707567621372702411448803, 2955418704408380517540605162821, 40101878131071637461151318174173269]

cp's OEIS Frontend

A339057 a(n) = (-1)^(n + 1)3^(2n + 1)Euler(2n + 1, 1/3)2^(valuation_{2}(2(n + 1))), the Steinhaus-Euler sequence S_{3}(n).

Table of values

List of values

cp's OEIS Frontend

A339057 a(n) = (-1)^(n + 1)*3^(2*n + 1)*Euler(2*n + 1, 1/3)*2^(valuation_{2}(2*(n + 1))), the Steinhaus-Euler sequence S_{3}(n).

Table of values

List of values

A339057 a(n) = (-1)^(n + 1)3^(2n + 1)Euler(2n + 1, 1/3)2^(valuation_{2}(2(n + 1))), the Steinhaus-Euler sequence S_{3}(n).