A011834 f-vectors for 2-neighborly simplicial complexes on n+1 vertices.
1, 2, 6, 27, 190, 2246, 48230, 2016372, 173567527, 32121018248, 13203989190379, 12355576970413489, 26815273007684770624, 136972327635873480206735, 1666402843785234768663681968
Offset: 1