One-quarter of the number of regions in the central square of an equal-armed cross with arms of length n (as in A331456).

A337641

One-quarter of the number of regions in the central square of an equal-armed cross with arms of length n (as in A331456).

Terms

    a(0) =1a(1) =14a(2) =70a(3) =231a(4) =576a(5) =1207a(6) =2255a(7) =3883a(8) =6267a(9) =9588a(10) =14088a(11) =20021a(12) =27667a(13) =37306a(14) =49240a(15) =63859a(16) =81517a(17) =102603a(18) =127545a(19) =156769a(20) =190739a(21) =229932a(22) =274898a(23) =326181a(24) =384332a(25) =449878a(26) =523472a(27) =605766a(28) =697380a(29) =799053

External references