Number of distinct grids after n moves in the 4D version of Morpion Solitaire.

Terms

a(0) =1a(1) =5a(2) =106a(3) =1174a(4) =10608a(5) =73709a(6) =419916a(7) =1991917a(8) =8027941a(9) =27842848a(10) =84184659a(11) =224072711a(12) =528129333a(13) =1104419319a(14) =2050193527a(15) =3377728678a(16) =4926536570a(17) =6324442265a(18) =7094518159a(19) =6907808080a(20) =5798009340a(21) =4159280242a(22) =2529867930a(23) =1303170244a(24) =577789811a(25) =233092437