Number of nX4 nonnegative integer arrays with upper left 0 and lower right n+4-5 and value increasing by 0 or 1 with every step right or down.
A252972
Number of nX4 nonnegative integer arrays with upper left 0 and lower right n+4-5 and value increasing by 0 or 1 with every step right or down.
Terms
- a(0) =1a(1) =13a(2) =153a(3) =1236a(4) =6997a(5) =30802a(6) =112877a(7) =359550a(8) =1024773a(9) =2667554a(10) =6438457a(11) =14575914a(12) =31230978a(13) =63789948a(14) =124931040a(15) =235737421a(16) =430298389a(17) =762367687a(18) =1314817821a(19) =2212837300a(20) =3642069999a(21) =5873199042a(22) =9294839027a(23) =14457028052a(24) =22128113529
External references
- oeis: A252972