Number of nX1 0..1 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.
A223220
Number of nX1 0..1 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.
Terms
- a(0) =2a(1) =4a(2) =5a(3) =11a(4) =19a(5) =37a(6) =68a(7) =137a(8) =261a(9) =547a(10) =1047a(11) =2085a(12) =4158a(13) =8483a(14) =16466a(15) =33212a(16) =66193a(17) =131898a(18) =263948a(19) =527527a(20) =1050219a(21) =2116671a(22) =4211442a(23) =8401051a(24) =16832288a(25) =33765064a(26) =67162966a(27) =134559866a(28) =269065487a(29) =537669433
External references
- oeis: A223220