A256939 - cp's OEIS frontend

A256939 Expansion of g.f.: (1-4z-sqrt(1-8z+12z^2+8z^3-4z^4))/(2z^2(1-z)).

n	a(n)
0	1
1	3
2	13
3	57
4	257
5	1185
6	5573
7	26661
8	129437
9	636429
10	3163725
11	15877101
12	80340813
13	409495053
14	2100558429
15	10836262173
16	56184433661
17	292628726205
18	1530338756093
19	8032671187581
20	42304703640701
21	223484135199357
22	1183921500416509
23	6288098247289341

[1, 3, 13, 57, 257, 1185, 5573, 26661, 129437, 636429, 3163725, 15877101, 80340813, 409495053, 2100558429, 10836262173, 56184433661, 292628726205, 1530338756093, 8032671187581, 42304703640701, 223484135199357, 1183921500416509, 6288098247289341]

cp's OEIS Frontend

A256939 Expansion of g.f.: (1-4z-sqrt(1-8z+12z^2+8z^3-4z^4))/(2z^2(1-z)).

Table of values

List of values

cp's OEIS Frontend

A256939 Expansion of g.f.: (1-4*z-sqrt(1-8*z+12*z^2+8*z^3-4*z^4))/(2*z^2(1-z)).

Table of values

List of values

A256939 Expansion of g.f.: (1-4z-sqrt(1-8z+12z^2+8z^3-4z^4))/(2z^2(1-z)).