OFFSET
0,4
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..130
FORMULA
a(n) = A281871(2n,n).
EXAMPLE
a(0) = 1: {}.
a(1) = 1: {1}.
a(2) = 1: {1,3}.
a(3) = 3: {1,2,6}, {1,3,5}, {2,3,4}.
a(4) = 8: {1,2,5,8}, {1,2,6,7}, {1,3,4,8}, {1,3,5,7}, {1,4,5,6}, {2,3,4,7}, {2,3,5,6}, {4,6,7,8}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jan 31 2017
STATUS
approved