Number of n X 5 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A280551
Number of n X 5 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =2a(1) =87a(2) =325a(3) =832a(4) =1764a(5) =3438a(6) =6386a(7) =11506a(8) =20389a(9) =35757a(10) =62317a(11) =108150a(12) =187115a(13) =322925a(14) =556071a(15) =955574a(16) =1638882a(17) =2805542a(18) =4794088a(19) =8178068a(20) =13927945a(21) =23683803a(22) =40214243a(23) =68187902a(24) =115469449a(25) =195294823a(26) =329919371a(27) =556731676a(28) =938492304
External references
- oeis: A280551