Irregular array related to the Euler numbers, read by rows, T_row(n) = A326722_row(2*n) + A326722_row(2*n+1) for n >= 0, T_row(-1) = [1].

A326721

Irregular array related to the Euler numbers, read by rows, T_row(n) = A326722_row(2*n) + A326722_row(2*n+1) for n >= 0, T_row(-1) = [1].

Terms

    a(0) =1a(1) =-1a(2) =1a(3) =1a(4) =2a(5) =-1a(6) =-4a(7) =1a(8) =2a(9) =-16a(10) =5a(11) =48a(12) =-10a(13) =-48a(14) =5a(15) =16a(16) =272a(17) =-61a(18) =-1088a(19) =183a(20) =1632a(21) =-183a(22) =-1088a(23) =61a(24) =272a(25) =-7936a(26) =1385a(27) =39680a(28) =-5540a(29) =-79360

External references