Number of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 and no column sum 0.
A254971
Number of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 0 or 1 and no antidiagonal sum 0 or 1 and no row sum 0 and no column sum 0.
Terms
- a(0) =121a(1) =310a(2) =1008a(3) =3241a(4) =9961a(5) =30529a(6) =94351a(7) =292130a(8) =902991a(9) =2789674a(10) =8620990a(11) =26645405a(12) =82350302a(13) =254503207a(14) =786546750a(15) =2430856047a(16) =7512657571a(17) =23218127711a(18) =71756425958a(19) =221765794486a(20) =685375122700
External references
- oeis: A254971