Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
A146044
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =7a(6) =15a(7) =37a(8) =79a(9) =277a(10) =1211a(11) =6171a(12) =28503a(13) =152765a(14) =945077a(15) =7764777a(16) =66517839a(17) =667569119a(18) =7061433273a(19) =91063498499
External references
- oeis: A146044