Number of n X 4 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.

A253219

Number of n X 4 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down.

Terms

    a(0) =3a(1) =9a(2) =19a(3) =19a(4) =268a(5) =1249a(6) =3140a(7) =5986a(8) =9792a(9) =14558a(10) =20284a(11) =26970a(12) =34616a(13) =43222a(14) =52788a(15) =63314a(16) =74800a(17) =87246a(18) =100652a(19) =115018a(20) =130344a(21) =146630a(22) =163876a(23) =182082a(24) =201248a(25) =221374a(26) =242460a(27) =264506a(28) =287512a(29) =311478

External references