A153232 - cp's OEIS frontend

A153232 a(n) = Sum((-1)^(n-i)binomial(3i,i)binomial(n+2i,3i)*2^i/(2i+1),i=0..n).

n	a(n)
0	1
1	1
2	5
3	31
4	217
5	1637
6	12985
7	106767
8	901857
9	7779321
10	68238029
11	606829087
12	5458425065
13	49575244557
14	454002681969
15	4187624605215
16	38868943003201
17	362779053190001
18	3402660186792277
19	32055797319184735
20	303189929508106169
21	2877922441328068981
22	27406770566397160361

[1, 1, 5, 31, 217, 1637, 12985, 106767, 901857, 7779321, 68238029, 606829087, 5458425065, 49575244557, 454002681969, 4187624605215, 38868943003201, 362779053190001, 3402660186792277, 32055797319184735, 303189929508106169, 2877922441328068981, 27406770566397160361]

cp's OEIS Frontend

A153232 a(n) = Sum((-1)^(n-i)binomial(3i,i)binomial(n+2i,3i)*2^i/(2i+1),i=0..n).

Table of values

List of values

cp's OEIS Frontend

A153232 a(n) = Sum((-1)^(n-i)*binomial(3i,i)*binomial(n+2i,3i)*2^i/(2i+1),i=0..n).

Table of values

List of values

A153232 a(n) = Sum((-1)^(n-i)binomial(3i,i)binomial(n+2i,3i)*2^i/(2i+1),i=0..n).