A370103 - cp's OEIS frontend

A370103 a(n) = Sum_{k=0..n} (-1)^k * binomial(2n+k-1,k) binomial(4*n-k-1,n-k).

n	a(n)
0	1
1	1
2	7
3	28
4	151
5	751
6	3976
7	20924
8	112023
9	602182
10	3260257
11	17724928
12	96766072
13	529977917
14	2910984412
15	16027963528
16	88440034711
17	488918693466
18	2707393587802
19	15014647096172
20	83380131228401
21	463593653171495
22	2580426581343200
23	14377474236172320

[1, 1, 7, 28, 151, 751, 3976, 20924, 112023, 602182, 3260257, 17724928, 96766072, 529977917, 2910984412, 16027963528, 88440034711, 488918693466, 2707393587802, 15014647096172, 83380131228401, 463593653171495, 2580426581343200, 14377474236172320]

cp's OEIS Frontend

A370103 a(n) = Sum_{k=0..n} (-1)^k * binomial(2n+k-1,k) binomial(4*n-k-1,n-k).

Table of values

List of values

cp's OEIS Frontend

A370103 a(n) = Sum_{k=0..n} (-1)^k * binomial(2*n+k-1,k) * binomial(4*n-k-1,n-k).

Table of values

List of values

A370103 a(n) = Sum_{k=0..n} (-1)^k * binomial(2n+k-1,k) binomial(4*n-k-1,n-k).