A065143 - cp's OEIS frontend

A065143 a(n) = Sum_{k=0..n} Stirling2(n,k)(1+(-1)^k)2^k/2.

n	a(n)
0	1
1	0
2	4
3	12
4	44
5	220
6	1228
7	7196
8	45004
9	303900
10	2201676
11	16920860
12	136966860
13	1163989788
14	10364408140
15	96463232284
16	935872773068
17	9440653262620
18	98809201693260
19	1071131795708188
20	12007932126074060

[1, 0, 4, 12, 44, 220, 1228, 7196, 45004, 303900, 2201676, 16920860, 136966860, 1163989788, 10364408140, 96463232284, 935872773068, 9440653262620, 98809201693260, 1071131795708188, 12007932126074060]

cp's OEIS Frontend

A065143 a(n) = Sum_{k=0..n} Stirling2(n,k)(1+(-1)^k)2^k/2.

Table of values

List of values

cp's OEIS Frontend

A065143 a(n) = Sum_{k=0..n} Stirling2(n,k)*(1+(-1)^k)*2^k/2.

Table of values

List of values

A065143 a(n) = Sum_{k=0..n} Stirling2(n,k)(1+(-1)^k)2^k/2.