Number of unique X-rays of n X n binary matrices with exactly floor(n^2/2) ones.

A290134

Number of unique X-rays of n X n binary matrices with exactly floor(n^2/2) ones.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =42a(6) =130a(7) =415a(8) =1368a(9) =4603a(10) =15788a(11) =54863a(12) =193112a(13) =686049a(14) =2459942a(15) =8881931a(16) =32292148a(17) =118038070a(18) =433790834a(19) =1601042055a(20) =5934546466a(21) =22074679425a(22) =82399006636a(23) =308471888767

External references