A373629 - cp's OEIS frontend

A373629 a(n) = sum of all numbers whose binary expansion is n bits long, starts and ends with a 1 bit, and contains no 00 bit pairs.

n	a(n)
1	1
2	3
3	12
4	39
5	131
6	426
7	1389
8	4503
9	14596
10	47259
11	152991
12	495162
13	1602521
14	5186067
15	16782828
16	54310911
17	175754731
18	568755690
19	1840534485
20	5956098495
21	19274345876
22	62373103443
23	201843619047
24	653179698234
25	2113733947681
26	6840186809691
27	22135309606524
28	71631366769623

[1, 3, 12, 39, 131, 426, 1389, 4503, 14596, 47259, 152991, 495162, 1602521, 5186067, 16782828, 54310911, 175754731, 568755690, 1840534485, 5956098495, 19274345876, 62373103443, 201843619047, 653179698234, 2113733947681, 6840186809691, 22135309606524, 71631366769623]

cp's OEIS Frontend

A373629 a(n) = sum of all numbers whose binary expansion is n bits long, starts and ends with a 1 bit, and contains no 00 bit pairs.

Table of values

List of values