A072287 - cp's OEIS frontend

A072287 Let f(n, m) = binomial(n - m/2 + 1, n - m + 1) - binomial(n - m/2, n - m + 1) and let s(n) = Sum_{k=0..n} f(n, k); then a(n) = numerator of s(n).

n	a(n)
0	1
1	2
2	7
3	47
4	155
5	2027
6	6597
7	42835
8	138875
9	3599155
10	11654465
11	75457289
12	244238477
13	3161900479
14	10232916665
15	66231885067
16	214336798299
17	11097918730051
18	35913975952793
19	232441522435405
20	752199270651129

[1, 2, 7, 47, 155, 2027, 6597, 42835, 138875, 3599155, 11654465, 75457289, 244238477, 3161900479, 10232916665, 66231885067, 214336798299, 11097918730051, 35913975952793, 232441522435405, 752199270651129]

cp's OEIS Frontend

A072287 Let f(n, m) = binomial(n - m/2 + 1, n - m + 1) - binomial(n - m/2, n - m + 1) and let s(n) = Sum_{k=0..n} f(n, k); then a(n) = numerator of s(n).

Table of values

List of values