1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 27.
A159227
1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 27.
Terms
- a(0) =7a(1) =22a(2) =45a(3) =103a(4) =193a(5) =421a(6) =777a(7) =1681a(8) =3097a(9) =6697a(10) =12345a(11) =26713a(12) =49273a(13) =106681a(14) =196857a(15) =426361a(16) =786937a(17) =1704697a(18) =3146745a(19) =6817273a(20) =12584953a(21) =27266041a(22) =50335737a(23) =109058041a(24) =201334777a(25) =436219897
External references
- oeis: A159227