A152972 - OEIS

%I #3 Mar 30 2012 17:34:28

%S 1,1,1,1,8,1,1,39,39,1,1,110,658,110,1,1,1232,4927,4927,1232,1,1,

%T 17453,34906,104720,34906,17453,1,1,299200,598400,1196799,1196799,

%U 598400,299200,1,1,6021400,12042800,18064200,24085598,18064200,12042800

%N A vector sequence with set row sum function: row(n)=-Product[3*k - 1, {k, 0, n}] and linear build up and decline function: f(n,m)=Floor[(m/n)*row(n)].

%C row sums -Product[3*k - 1, {k, 0, n}]:A008544

%C {1, 2, 10, 80, 880, 12320, 209440, 4188800, 96342400, 2504902400, 72642169600,

%C 2324549427200, 81359229952000, 3091650738176000, 126757680265216000,

%C 5577337931669504000, 262134882788466688000, 13106744139423334400000,

%C 694657439389436723200000,...}

%F row(n)=(2*n)!/n!: f(n,m)=Floor[(m/n)*row(n)].

%e {1},

%e {1, 1},

%e {1, 8, 1},

%e {1, 39, 39, 1},

%e {1, 110, 658, 110, 1},

%e {1, 1232, 4927, 4927, 1232, 1},

%e {1, 17453, 34906, 104720, 34906, 17453, 1},

%e {1, 299200, 598400, 1196799, 1196799, 598400, 299200, 1},

%e {1, 6021400, 12042800, 18064200, 24085598, 18064200, 12042800, 6021400, 1},

%e {1, 139161244, 278322488, 417483733, 417483734, 417483734, 417483733, 278322488, 139161244, 1},

%e {1, 3632108480, 7264216960, 10896325440, 14528433920, -2, 14528433920, 10896325440, 7264216960, 3632108480, 1}

%t Clear[v, n, row, f]; row[n_] = -Product[3*k - 1, {k, 0, n}];

%t f[n_, m_] = Floor[(m/n)*row[n]/2]; v[0] = {1}; v[1] = {1, 1};

%t v[n_] := v[n] = If[Mod[n, 2] == 0, Join[{1}, Table[ f[n, m], {m, 1, Floor[ n/2] - 1}], {row[n] - 2*Sum[ f[n, m], {m, 1, Floor[n/2] - 1}] - 2}, Table[ f[n, m], {m, Floor[n/ 2] - 1, 1, -1}], { 1}],

%t Join[{1}, Table[ f[n, m], {m, 1, Floor[n/2] - 1}], {row[n]/2 - Sum[ f[n, m], { m, 1, Floor[n/2] - 1}] - 1, row[n]/ 2 - Sum[ f[n, m], {m, 1, Floor[ n/2] - 1}] - 1}, Table[ f[n, m], {m, Floor[n/ 2] - 1, 1, -1}], {1}]];

%t Table[FullSimplify[v[n]], {n, 0, 10}]; Flatten[%]

%Y A008544, A142458, A142459

%K nonn,tabl

%O 0,5

%A _Roger L. Bagula_, Dec 16 2008