A137155 - cp's OEIS frontend

A137155 a(n) = Sum_{k=0..[n/2]} C(2^k + n-2k-1, n-2k); equals the antidiagonal sums of triangle A137153.

n	a(n)
0	1
1	1
2	2
3	3
4	5
5	9
6	17
7	35
8	80
9	201
10	561
11	1771
12	6298
13	25217
14	115440
15	605243
16	3609754
17	24742305
18	196470603
19	1792166979
20	18817616610
21	230233601737
22	3268914688382
23	53509699527491
24	1020486454701731
25	22777217813040393
26	589097686208575727

[1, 1, 2, 3, 5, 9, 17, 35, 80, 201, 561, 1771, 6298, 25217, 115440, 605243, 3609754, 24742305, 196470603, 1792166979, 18817616610, 230233601737, 3268914688382, 53509699527491, 1020486454701731, 22777217813040393, 589097686208575727]

cp's OEIS Frontend

A137155 a(n) = Sum_{k=0..[n/2]} C(2^k + n-2k-1, n-2k); equals the antidiagonal sums of triangle A137153.

Table of values

List of values