A255550 Main diagonal of array A255551.

2, 5, 39, 91, 199, 315, 567, 829, 1227, 1513, 1953, 2569, 3277, 3769, 5119, 5925, 6607, 7539, 8319, 9375, 11007, 12511, 14103, 15801, 17593, 19165, 22213, 23617, 25467, 26967, 29347, 32733, 35809, 38085, 40953, 42915, 49093, 51787, 54055, 57459, 60409, 64057, 68433, 71637, 76299, 79719, 82545, 86133, 94921, 98037, 102745

Offset

1,1

Comments

Equally, 2 followed by the first subdiagonal of A255543.

Links

Table of n, a(n) for n=1..51.

Formula

a(n) = A255551(n,n).

a(1) = 2; for n > 1: a(n) = A255543(n,n-1).

Other identities.

For all n >= 1, a(n) = A255553(A083141(n)).

Prog

(Scheme, two variants)
(define (A255550 n) (if (= 1 n) 2 (A255543bi n (- n 1)))) ;; A255543bi is given in A255543.
(define (A255550v2 n) (A255551bi n n)) ;; A255551bi is given in A255551.

Crossrefs

Cf. A255543, A255551, A255549.

Cf. also A083141, A255410, A255553.

Sequence in context: A206155 A135378 A077398 * A362800 A357822 A183255

Adjacent sequences: A255547 A255548 A255549 * A255551 A255552 A255553

Keyword

nonn

Author

Antti Karttunen, Feb 26 2015

Status

approved