A126221 - cp's OEIS frontend

A126221 a(n)=c(n)+c(n-1)+2c(n-2)+4c(n-3)+8c(n-4)+...+2^(n-2)c(1)+2^(n-1)*c(0), where c(k) are the Catalan numbers (A000108).

n	a(n)
0	1
1	2
2	5
3	13
4	35
5	98
6	286
7	869
8	2739
9	8910
10	29754
11	101498
12	352222
13	1239332
14	4410204
15	15840813
16	57344451
17	208976022
18	765945954
19	2821516398
20	10439890026
21	38781926652
22	144580149924
23	540737349858
24	2028319233390
25	7628680720908

[1, 2, 5, 13, 35, 98, 286, 869, 2739, 8910, 29754, 101498, 352222, 1239332, 4410204, 15840813, 57344451, 208976022, 765945954, 2821516398, 10439890026, 38781926652, 144580149924, 540737349858, 2028319233390, 7628680720908]

cp's OEIS Frontend

A126221 a(n)=c(n)+c(n-1)+2c(n-2)+4c(n-3)+8c(n-4)+...+2^(n-2)c(1)+2^(n-1)*c(0), where c(k) are the Catalan numbers (A000108).

Table of values

List of values

cp's OEIS Frontend

A126221 a(n)=c(n)+c(n-1)+2*c(n-2)+4*c(n-3)+8*c(n-4)+...+2^(n-2)*c(1)+2^(n-1)*c(0), where c(k) are the Catalan numbers (A000108).

Table of values

List of values

A126221 a(n)=c(n)+c(n-1)+2c(n-2)+4c(n-3)+8c(n-4)+...+2^(n-2)c(1)+2^(n-1)*c(0), where c(k) are the Catalan numbers (A000108).