Number of n X 4 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it).
A202545
Number of n X 4 nonnegative integer arrays each row and column an ascent sequence (interior element no greater than one plus up-steps preceding it).
Terms
- a(0) =1a(1) =8a(2) =86a(3) =1094a(4) =15184a(5) =219934a(6) =3249298a(7) =48427802a(8) =724492208a(9) =10855670258a(10) =162764756218
External references
- oeis: A202545