A328681 - cp's OEIS frontend

A328681 a(n) = Sum_{k=1..n} binomial(n,k) * tau(k) * tau(n - k + 1), where tau = A000005.

n	a(n)
1	1
2	6
3	20
4	55
5	142
6	322
7	779
8	1608
9	3894
10	7370
11	18372
12	33137
13	81512
14	149694
15	353224
16	641461
17	1570836
18	2684928
19	6642915
20	11795178
21	28133846
22	46768200
23	125433400
24	197654545
25	485749918
26	893864394
27	2066417482
28	3385115393
29	8975476976
30	14384181908
31	35478028091
32	61940000322

[1, 6, 20, 55, 142, 322, 779, 1608, 3894, 7370, 18372, 33137, 81512, 149694, 353224, 641461, 1570836, 2684928, 6642915, 11795178, 28133846, 46768200, 125433400, 197654545, 485749918, 893864394, 2066417482, 3385115393, 8975476976, 14384181908, 35478028091, 61940000322]

cp's OEIS Frontend

A328681 a(n) = Sum_{k=1..n} binomial(n,k) * tau(k) * tau(n - k + 1), where tau = A000005.

Table of values

List of values