Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 4 X 4 X 4 subtriangle.
A153903
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 4 X 4 X 4 subtriangle.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =3a(5) =7a(6) =10a(7) =21a(8) =34a(9) =88a(10) =150a(11) =421a(12) =807a(13) =2708a(14) =6019a(15) =22444a(16) =58037a(17) =245472a(18) =706322a(19) =3364913a(20) =10967191a(21) =59955069a(22) =222028350a(23) =1374087876a(24) =5812458172a(25) =40846719268a(26) =195779164954
External references
- oeis: A153903