A279196 - cp's OEIS frontend

A279196 Number of polynomials of the form P(x,y) = 1 + (x+y-1) * Q(x,y) such that P(1,1) = n and both polynomials P and Q have nonnegative integer coefficients.

n	a(n)
1	1
2	1
3	2
4	5
5	13
6	36
7	102
8	295
9	864
10	2557
11	7624
12	22868
13	68920
14	208527
15	632987
16	1926752
17	5878738
18	17973523
19	55050690
20	168881464
21	518818523
22	1595878573
23	4914522147
24	15150038699
25	46747391412
26	144370209690
27	446214862158
28	1380161749537
29	4271808447154
30	13230257155092
31	40999697820032

[1, 1, 2, 5, 13, 36, 102, 295, 864, 2557, 7624, 22868, 68920, 208527, 632987, 1926752, 5878738, 17973523, 55050690, 168881464, 518818523, 1595878573, 4914522147, 15150038699, 46747391412, 144370209690, 446214862158, 1380161749537, 4271808447154, 13230257155092, 40999697820032]

cp's OEIS Frontend

A279196 Number of polynomials of the form P(x,y) = 1 + (x+y-1) * Q(x,y) such that P(1,1) = n and both polynomials P and Q have nonnegative integer coefficients.

Table of values

List of values