Column 2 of triangle A129100; also equals column 0 of matrix power A129100^4.
A129102
Column 2 of triangle A129100; also equals column 0 of matrix power A129100^4.
Terms
- a(0) =1a(1) =4a(2) =20a(3) =136a(4) =1360a(5) =21204a(6) =537748a(7) =22891448a(8) =1675538928a(9) =214841466180
External references
- oeis: A129102