The answer is 91tvb now,tvbnow,bttvb; n! z+ Q+ m3 N- \3 G5 K0 g$ x
1 row 3x4+1x3=15
8 O* R4 Q+ O9 g! B8 L( v: w% {2 row 4x5+2x4=28: T' R1 c, m8 [) O5 i
3 row 5x6+3x5=45: D$ Y% z, A d9 [" O7 b
4 row 6x7+4x6=66tvb now,tvbnow,bttvb6 ]% r$ u% K l+ I/ x
5 row 7x8+5x7=91  |