A130813 - cp's OEIS frontend

A130813 If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 7-subsets of X containing none of X_i, (i=1,...n).

n	a(n)
7	128
8	1024
9	4608
10	15360
11	42240
12	101376
13	219648
14	439296
15	823680
16	1464320
17	2489344
18	4073472
19	6449664
20	9922560
21	14883840
22	21829632
23	31380096
24	44301312
25	61529600
26	84198400
27	113667840
28	151557120
29	199779840
30	260582400
31	336585600
32	430829568

[128, 1024, 4608, 15360, 42240, 101376, 219648, 439296, 823680, 1464320, 2489344, 4073472, 6449664, 9922560, 14883840, 21829632, 31380096, 44301312, 61529600, 84198400, 113667840, 151557120, 199779840, 260582400, 336585600, 430829568]

cp's OEIS Frontend

A130813 If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 7-subsets of X containing none of X_i, (i=1,...n).

Table of values

List of values