Column 0 of triangle A138271; also, column 3 of A138271 shift left; also, column 0 of matrix power A138271^4 shift right.
A138272
Column 0 of triangle A138271; also, column 3 of A138271 shift left; also, column 0 of matrix power A138271^4 shift right.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =28a(4) =268a(5) =3164a(6) =43672a(7) =682632a(8) =11834536a(9) =224283416a(10) =4597330748a(11) =101100605540
External references
- oeis: A138272