A221973 - cp's OEIS frontend

A221973 G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (3 + kx)/(1 + 3kx + k^2x^2).

n	a(n)
0	1
1	3
2	10
3	39
4	183
5	1026
6	6695
7	49623
8	411050
9	3763599
10	37757055
11	411894882
12	4854301087
13	61459583007
14	831926801290
15	11989221944871
16	183273754945959
17	2961997167865410
18	50462267599637975
19	903853088211536295
20	16980055625062979306
21	333846342195447641343

[1, 3, 10, 39, 183, 1026, 6695, 49623, 411050, 3763599, 37757055, 411894882, 4854301087, 61459583007, 831926801290, 11989221944871, 183273754945959, 2961997167865410, 50462267599637975, 903853088211536295, 16980055625062979306, 333846342195447641343]

cp's OEIS Frontend

A221973 G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (3 + kx)/(1 + 3kx + k^2x^2).

Table of values

List of values

cp's OEIS Frontend

A221973 G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (3 + k*x)/(1 + 3*k*x + k^2*x^2).

Table of values

List of values

A221973 G.f.: Sum_{n>=0} n! * x^n * Product_{k=1..n} (3 + kx)/(1 + 3kx + k^2x^2).