Number of (n+1)X3 0..1 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero.
A204734
Number of (n+1)X3 0..1 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero.
Terms
- a(0) =15a(1) =43a(2) =115a(3) =304a(4) =787a(5) =2033a(6) =5219a(7) =13398a(8) =34331a(9) =87991a(10) =225395a(11) =577452a(12) =1479139a(13) =3789069a(14) =9705763a(15) =24862194a(16) =63685419a(17) =163134387a(18) =417876275a(19) =1070414056a(20) =2741919411a(21) =7023575913a(22) =17991253859a(23) =46085557838a(24) =118050573627a(25) =302392805359a(26) =774595100275
External references
- oeis: A204734