A218135 - cp's OEIS frontend

A218135 Norm of coefficients in the expansion of 1 / (1 - x - 2Ix^2), where I^2=-1.

n	a(n)
0	1
1	1
2	5
3	17
4	45
5	185
6	533
7	1921
8	6205
9	20745
10	69541
11	229585
12	769613
13	2552537
14	8515125
15	28340513
16	94357853
17	314301865
18	1046284741
19	3484682865
20	11602442605
21	38636214649
22	128653931093
23	428398492865
24	1426535718525
25	4750159951433
26	15817576773605
27	52670623373329

[1, 1, 5, 17, 45, 185, 533, 1921, 6205, 20745, 69541, 229585, 769613, 2552537, 8515125, 28340513, 94357853, 314301865, 1046284741, 3484682865, 11602442605, 38636214649, 128653931093, 428398492865, 1426535718525, 4750159951433, 15817576773605, 52670623373329]

cp's OEIS Frontend

A218135 Norm of coefficients in the expansion of 1 / (1 - x - 2Ix^2), where I^2=-1.

Table of values

List of values

cp's OEIS Frontend

A218135 Norm of coefficients in the expansion of 1 / (1 - x - 2*I*x^2), where I^2=-1.

Table of values

List of values

A218135 Norm of coefficients in the expansion of 1 / (1 - x - 2Ix^2), where I^2=-1.