Fill an infinite square array by following a spiral around the origin; in the central cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that are in the same row or column as that cell.
A334741
Fill an infinite square array by following a spiral around the origin; in the central cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that are in the same row or column as that cell.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =8a(7) =11a(8) =21a(9) =40a(10) =47a(11) =93a(12) =180a(13) =203a(14) =397a(15) =796a(16) =1576a(17) =1675a(18) =3305a(19) =6636a(20) =13192a(21) =14004a(22) =27607a(23) =55029a(24) =110192a(25) =220024a(26) =226740a(27) =450123a(28) =898661a(29) =1798700
External references
- oeis: A334741