Number of n X 4 nonnegative integer arrays with upper left 0 and lower right n+4-4 and value increasing by 0 or 1 with every step right or down.

A252872

Number of n X 4 nonnegative integer arrays with upper left 0 and lower right n+4-4 and value increasing by 0 or 1 with every step right or down.

Terms

    a(0) =3a(1) =26a(2) =153a(3) =615a(4) =1953a(5) =5281a(6) =12686a(7) =27805a(8) =56624a(9) =108549a(10) =197804a(11) =345216a(12) =580452a(13) =944778a(14) =1494415a(15) =2304572a(16) =3474241a(17) =5131844a(18) =7441827a(19) =10612301a(20) =14903835a(21) =20639511a(22) =28216356a(23) =38118271a(24) =50930582a(25) =67356343a(26) =88234526a(27) =114560238

External references