1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 25.

A159225

1/4 the number of n X n arrays of squares of integers with every 2X2 subblock summing to 25.

Terms

    a(0) =7a(1) =24a(2) =53a(3) =135a(4) =265a(5) =621a(6) =1169a(7) =2649a(8) =4897a(9) =10929a(10) =20033a(11) =44385a(12) =81025a(13) =178881a(14) =325889a(15) =718209a(16) =1307137a(17) =2878209a(18) =5235713a(19) =11523585a(20) =20957185a(21) =46115841a(22) =83857409a(23) =184506369a(24) =335486977

External references