Number of distinct grids after n moves in the 5D version of Morpion Solitaire.

Terms

a(0) =1a(1) =4a(2) =55a(3) =404a(4) =2462a(5) =11196a(6) =41135a(7) =122897a(8) =307319a(9) =652286a(10) =1199755a(11) =1950378a(12) =2885188a(13) =4043706a(14) =5718245a(15) =8888485a(16) =16594082a(17) =39074532a(18) =115646521a(19) =414852909a(20) =1714717418a(21) =7743579586a(22) =36521752030a(23) =174522348856