Number of nX7 nonnegative integer arrays with upper left 0 and lower right n+7-4 and value increasing by 0 or 1 with every step right or down.

A252875

Number of nX7 nonnegative integer arrays with upper left 0 and lower right n+7-4 and value increasing by 0 or 1 with every step right or down.

Terms

    a(0) =15a(1) =211a(2) =1948a(3) =12686a(4) =64920a(5) =277585a(6) =1030330a(7) =3407823a(8) =10237249a(9) =28340232a(10) =73128376a(11) =177500233a(12) =408299906a(13) =895580310a(14) =1882850350a(15) =3810729118a(16) =7452433875a(17) =14127861337a(18) =26034391284a(19) =46747817584a(20) =81967052716a(21) =140602733711

External references