A172389 - cp's OEIS frontend

A172389 a(n) = Sum_{k=0..n} C(n,k)3^(k(n-k))/2^n.

n	a(n)
0	1
1	1
2	2
3	7
4	44
5	481
6	9272
7	310087
8	18164624
9	1843946881
10	326808099872
11	100310221406407
12	53656068398769344
13	49686835289802328801
14	80090696216400251499392
15	223445962168511596412895367

[1, 1, 2, 7, 44, 481, 9272, 310087, 18164624, 1843946881, 326808099872, 100310221406407, 53656068398769344, 49686835289802328801, 80090696216400251499392, 223445962168511596412895367]

cp's OEIS Frontend

A172389 a(n) = Sum_{k=0..n} C(n,k)3^(k(n-k))/2^n.

Table of values

List of values

cp's OEIS Frontend

A172389 a(n) = Sum_{k=0..n} C(n,k)*3^(k*(n-k))/2^n.

Table of values

List of values

A172389 a(n) = Sum_{k=0..n} C(n,k)3^(k(n-k))/2^n.